| slovo | definícia |
focus
(mass) | focus
- ohniskový, poroznosť, ohnisko, zaostriť, koncentrovať,
sústrediť (sa) |
focus
(encz) | focus,koncentrovat v: Zdeněk Brož |
focus
(encz) | focus,ohnisko n: [mat.] |
focus
(encz) | focus,ohniskový adj: Zdeněk Brož |
focus
(encz) | focus,pozornost n: Zdeněk Brož |
focus
(encz) | focus,soustředit v: Zdeněk Brož |
focus
(encz) | focus,soustředit se Zdeněk Brož |
focus
(encz) | focus,zaostřit Hynek Hanke |
Focus
(gcide) | Focus \Fo"cus\, v. t. [imp. & p. p. Focused; p. pr. & vb. n.
Focusing.]
To bring to a focus; to focalize; as, to focus a camera. --R.
Hunt.
[1913 Webster] |
Focus
(gcide) | Focus \Fo"cus\ (f[=o]"k[u^]s), n.; pl. E. Focuses
(f[=o]"k[u^]s*[e^]z), L. Foci (f[=o]"s[imac]). [L. focus
hearth, fireplace; perh. akin to E. bake. Cf. Curfew,
Fuel, Fusil the firearm.]
1. (Opt.) A point in which the rays of light meet, after
being reflected or refracted, and at which the image is
formed; as, the focus of a lens or mirror.
[1913 Webster]
2. (Geom.) A point so related to a conic section and certain
straight line called the directrix that the ratio of the
distance between any point of the curve and the focus to
the distance of the same point from the directrix is
constant.
[1913 Webster]
Note: Thus, in the ellipse FGHKLM, A is the focus and CD the
directrix, when the ratios FA:FE, GA:GD, MA:MC, etc.,
are all equal. So in the hyperbola, A is the focus and
CD the directrix when the ratio HA:HK is constant for
all points of the curve; and in the parabola, A is the
focus and CD the directrix when the ratio BA:BC is
constant. In the ellipse this ratio is less than unity,
in the parabola equal to unity, and in the hyperbola
greater than unity. The ellipse and hyperbola have each
two foci, and two corresponding directrixes, and the
parabola has one focus and one directrix. In the
ellipse the sum of the two lines from any point of the
curve to the two foci is constant; that is: AG + GB =
AH + HB; and in the hyperbola the difference of the
corresponding lines is constant. The diameter which
passes through the foci of the ellipse is the major
axis. The diameter which being produced passes through
the foci of the hyperbola is the transverse axis. The
middle point of the major or the transverse axis is the
center of the curve. Certain other curves, as the
lemniscate and the Cartesian ovals, have points called
foci, possessing properties similar to those of the
foci of conic sections. In an ellipse, rays of light
coming from one focus, and reflected from the curve,
proceed in lines directed toward the other; in an
hyperbola, in lines directed from the other; in a
parabola, rays from the focus, after reflection at the
curve, proceed in lines parallel to the axis. Thus rays
from A in the ellipse are reflected to B; rays from A
in the hyperbola are reflected toward L and M away from
B.
[1913 Webster]
3. A central point; a point of concentration.
[1913 Webster]
Aplanatic focus. (Opt.) See under Aplanatic.
Conjugate focus (Opt.), the focus for rays which have a
sensible divergence, as from a near object; -- so called
because the positions of the object and its image are
interchangeable.
Focus tube (Phys.), a vacuum tube for R[oe]ntgen rays in
which the cathode rays are focused upon the anticathode,
for intensifying the effect.
Principal focus, or Solar focus (Opt.), the focus for
parallel rays.
[1913 Webster] |
focus
(wn) | focus
n 1: the concentration of attention or energy on something; "the
focus of activity shifted to molecular biology"; "he had no
direction in his life" [syn: focus, focusing,
focussing, focal point, direction, centering]
2: maximum clarity or distinctness of an image rendered by an
optical system; "in focus"; "out of focus"
3: maximum clarity or distinctness of an idea; "the controversy
brought clearly into focus an important difference of
opinion"
4: a central point or locus of an infection in an organism; "the
focus of infection" [syn: focus, focal point, nidus]
5: special emphasis attached to something; "the stress was more
on accuracy than on speed" [syn: stress, focus]
6: a point of convergence of light (or other radiation) or a
point from which it diverges [syn: focus, focal point]
7: a fixed reference point on the concave side of a conic
section
v 1: direct one's attention on something; "Please focus on your
studies and not on your hobbies" [syn: concentrate,
focus, center, centre, pore, rivet]
2: cause to converge on or toward a central point; "Focus the
light on this image" [ant: blur]
3: bring into focus or alignment; to converge or cause to
converge; of ideas or emotions [syn: concenter,
concentre, focalize, focalise, focus]
4: become focussed or come into focus; "The light focused" [syn:
focus, focalize, focalise] [ant: blur, dim, slur]
5: put (an image) into focus; "Please focus the image; we cannot
enjoy the movie" [syn: focus, focalize, focalise,
sharpen] [ant: blear, blur] |
focus
(foldoc) | FOCUS
A hierarchical database language from
Information Builders, Inc.
(1994-12-21)
|
| | podobné slovo | definícia |
focus
(mass) | focus
- ohniskový, poroznosť, ohnisko, zaostriť, koncentrovať,
sústrediť (sa) |
focused
(mass) | focused
- cieľavedomý |
focuses
(mass) | focuses
- ohniská |
focussed
(mass) | focussed
- zameraný |
artificial focus of epizooty
(encz) | artificial focus of epizooty,umělé ohnisko epizoocie [eko.] RNDr. Pavel
Piskač |
defocus
(encz) | defocus, |
focus
(encz) | focus,koncentrovat v: Zdeněk Brožfocus,ohnisko n: [mat.] focus,ohniskový adj: Zdeněk Brožfocus,pozornost n: Zdeněk Brožfocus,soustředit v: Zdeněk Brožfocus,soustředit se Zdeněk Brožfocus,zaostřit Hynek Hanke |
focus groups
(encz) | focus groups,cílová skupina [eko.] RNDr. Pavel Piskač |
focus on
(encz) | focus on,soustředit se na Zdeněk Brož |
focused
(encz) | focused,cílevědomý Jaroslav Šedivýfocused,rozhodný Jaroslav Šedivý |
focuses
(encz) | focuses,ohniska Jaroslav Šedivýfocuses,zaostřuje v: Zdeněk Brož |
focusing
(encz) | focusing,zaostřování n: Zdeněk Brož |
focussed
(encz) | focussed,zaměřený adj: Zdeněk Brož |
focussing
(encz) | focussing,soustřeďování n: Zdeněk Brožfocussing,zaměřování n: Zdeněk Brožfocussing,zaměřující adj: Zdeněk Brožfocussing,zaostřování n: Zdeněk Brož |
in focus
(encz) | in focus, adj: |
latent focus of infection
(encz) | latent focus of infection,latentní ohnisko infekce [eko.] RNDr. Pavel
Piskač |
out of focus
(encz) | out of focus, adj: |
refocus
(encz) | refocus, |
refocuses
(encz) | refocuses, |
refocusing
(encz) | refocusing, n: |
refocussed
(encz) | refocussed, |
refocusses
(encz) | refocusses, |
refocussing
(encz) | refocussing, |
unfocused
(encz) | unfocused,nezaměřený adj: Zdeněk Brož |
unfocussed
(encz) | unfocussed,nezaostřený adj: Zdeněk Brož |
customer focused integrated product team
(czen) | Customer Focused Integrated Product Team,CFIPT[zkr.] [voj.] Zdeněk Brož
a automatický překlad |
Aplanatic focus
(gcide) | Focus \Fo"cus\ (f[=o]"k[u^]s), n.; pl. E. Focuses
(f[=o]"k[u^]s*[e^]z), L. Foci (f[=o]"s[imac]). [L. focus
hearth, fireplace; perh. akin to E. bake. Cf. Curfew,
Fuel, Fusil the firearm.]
1. (Opt.) A point in which the rays of light meet, after
being reflected or refracted, and at which the image is
formed; as, the focus of a lens or mirror.
[1913 Webster]
2. (Geom.) A point so related to a conic section and certain
straight line called the directrix that the ratio of the
distance between any point of the curve and the focus to
the distance of the same point from the directrix is
constant.
[1913 Webster]
Note: Thus, in the ellipse FGHKLM, A is the focus and CD the
directrix, when the ratios FA:FE, GA:GD, MA:MC, etc.,
are all equal. So in the hyperbola, A is the focus and
CD the directrix when the ratio HA:HK is constant for
all points of the curve; and in the parabola, A is the
focus and CD the directrix when the ratio BA:BC is
constant. In the ellipse this ratio is less than unity,
in the parabola equal to unity, and in the hyperbola
greater than unity. The ellipse and hyperbola have each
two foci, and two corresponding directrixes, and the
parabola has one focus and one directrix. In the
ellipse the sum of the two lines from any point of the
curve to the two foci is constant; that is: AG + GB =
AH + HB; and in the hyperbola the difference of the
corresponding lines is constant. The diameter which
passes through the foci of the ellipse is the major
axis. The diameter which being produced passes through
the foci of the hyperbola is the transverse axis. The
middle point of the major or the transverse axis is the
center of the curve. Certain other curves, as the
lemniscate and the Cartesian ovals, have points called
foci, possessing properties similar to those of the
foci of conic sections. In an ellipse, rays of light
coming from one focus, and reflected from the curve,
proceed in lines directed toward the other; in an
hyperbola, in lines directed from the other; in a
parabola, rays from the focus, after reflection at the
curve, proceed in lines parallel to the axis. Thus rays
from A in the ellipse are reflected to B; rays from A
in the hyperbola are reflected toward L and M away from
B.
[1913 Webster]
3. A central point; a point of concentration.
[1913 Webster]
Aplanatic focus. (Opt.) See under Aplanatic.
Conjugate focus (Opt.), the focus for rays which have a
sensible divergence, as from a near object; -- so called
because the positions of the object and its image are
interchangeable.
Focus tube (Phys.), a vacuum tube for R[oe]ntgen rays in
which the cathode rays are focused upon the anticathode,
for intensifying the effect.
Principal focus, or Solar focus (Opt.), the focus for
parallel rays.
[1913 Webster]Aplanatic \Ap`la*nat"ic\, a. [Gr. 'a priv. + ? disposed to
wander, wandering, ? to wander.] (Opt.)
Having two or more parts of different curvatures, so combined
as to remove spherical aberration; -- said of a lens.
[1913 Webster]
Aplanatic focus of a lens (Opt.), the point or focus from
which rays diverging pass the lens without spherical
aberration. In certain forms of lenses there are two such
foci; and it is by taking advantage of this fact that the
best aplanatic object glasses of microscopes are
constructed.
[1913 Webster] |
Conjugate focus
(gcide) | Focus \Fo"cus\ (f[=o]"k[u^]s), n.; pl. E. Focuses
(f[=o]"k[u^]s*[e^]z), L. Foci (f[=o]"s[imac]). [L. focus
hearth, fireplace; perh. akin to E. bake. Cf. Curfew,
Fuel, Fusil the firearm.]
1. (Opt.) A point in which the rays of light meet, after
being reflected or refracted, and at which the image is
formed; as, the focus of a lens or mirror.
[1913 Webster]
2. (Geom.) A point so related to a conic section and certain
straight line called the directrix that the ratio of the
distance between any point of the curve and the focus to
the distance of the same point from the directrix is
constant.
[1913 Webster]
Note: Thus, in the ellipse FGHKLM, A is the focus and CD the
directrix, when the ratios FA:FE, GA:GD, MA:MC, etc.,
are all equal. So in the hyperbola, A is the focus and
CD the directrix when the ratio HA:HK is constant for
all points of the curve; and in the parabola, A is the
focus and CD the directrix when the ratio BA:BC is
constant. In the ellipse this ratio is less than unity,
in the parabola equal to unity, and in the hyperbola
greater than unity. The ellipse and hyperbola have each
two foci, and two corresponding directrixes, and the
parabola has one focus and one directrix. In the
ellipse the sum of the two lines from any point of the
curve to the two foci is constant; that is: AG + GB =
AH + HB; and in the hyperbola the difference of the
corresponding lines is constant. The diameter which
passes through the foci of the ellipse is the major
axis. The diameter which being produced passes through
the foci of the hyperbola is the transverse axis. The
middle point of the major or the transverse axis is the
center of the curve. Certain other curves, as the
lemniscate and the Cartesian ovals, have points called
foci, possessing properties similar to those of the
foci of conic sections. In an ellipse, rays of light
coming from one focus, and reflected from the curve,
proceed in lines directed toward the other; in an
hyperbola, in lines directed from the other; in a
parabola, rays from the focus, after reflection at the
curve, proceed in lines parallel to the axis. Thus rays
from A in the ellipse are reflected to B; rays from A
in the hyperbola are reflected toward L and M away from
B.
[1913 Webster]
3. A central point; a point of concentration.
[1913 Webster]
Aplanatic focus. (Opt.) See under Aplanatic.
Conjugate focus (Opt.), the focus for rays which have a
sensible divergence, as from a near object; -- so called
because the positions of the object and its image are
interchangeable.
Focus tube (Phys.), a vacuum tube for R[oe]ntgen rays in
which the cathode rays are focused upon the anticathode,
for intensifying the effect.
Principal focus, or Solar focus (Opt.), the focus for
parallel rays.
[1913 Webster]Conjugate \Con"ju*gate\, a. [L. conjugatus, p. p. or conjugare
to unite; con- + jugare to join, yoke, marry, jugum yoke;
akin to jungere to join. See Join.]
1. United in pairs; yoked together; coupled.
[1913 Webster]
2. (Bot.) In single pairs; coupled.
[1913 Webster]
3. (Chem.) Containing two or more compounds or radicals
supposed to act the part of a single one. [R.]
[1913 Webster]
4. (Gram.) Agreeing in derivation and radical signification;
-- said of words.
[1913 Webster]
5. (Math.) Presenting themselves simultaneously and having
reciprocal properties; -- frequently used in pure and
applied mathematics with reference to two quantities,
points, lines, axes, curves, etc.
[1913 Webster]
Conjugate axis of a hyperbola (Math.), the line through the
center of the curve, perpendicular to the line through the
two foci.
Conjugate diameters (Conic Sections), two diameters of an
ellipse or hyperbola such that each bisects all chords
drawn parallel to the other.
Conjugate focus (Opt.) See under Focus.
Conjugate mirrors (Optics), two mirrors so placed that rays
from the focus of one are received at the focus of the
other, especially two concave mirrors so placed that rays
proceeding from the principal focus of one and reflected
in a parallel beam are received upon the other and brought
to the principal focus.
Conjugate point (Geom.), an acnode. See Acnode, and
Double point.
Self-conjugate triangle (Conic Sections), a triangle each
of whose vertices is the pole of the opposite side with
reference to a conic.
[1913 Webster] |
Focus
(gcide) | Focus \Fo"cus\, v. t. [imp. & p. p. Focused; p. pr. & vb. n.
Focusing.]
To bring to a focus; to focalize; as, to focus a camera. --R.
Hunt.
[1913 Webster]Focus \Fo"cus\ (f[=o]"k[u^]s), n.; pl. E. Focuses
(f[=o]"k[u^]s*[e^]z), L. Foci (f[=o]"s[imac]). [L. focus
hearth, fireplace; perh. akin to E. bake. Cf. Curfew,
Fuel, Fusil the firearm.]
1. (Opt.) A point in which the rays of light meet, after
being reflected or refracted, and at which the image is
formed; as, the focus of a lens or mirror.
[1913 Webster]
2. (Geom.) A point so related to a conic section and certain
straight line called the directrix that the ratio of the
distance between any point of the curve and the focus to
the distance of the same point from the directrix is
constant.
[1913 Webster]
Note: Thus, in the ellipse FGHKLM, A is the focus and CD the
directrix, when the ratios FA:FE, GA:GD, MA:MC, etc.,
are all equal. So in the hyperbola, A is the focus and
CD the directrix when the ratio HA:HK is constant for
all points of the curve; and in the parabola, A is the
focus and CD the directrix when the ratio BA:BC is
constant. In the ellipse this ratio is less than unity,
in the parabola equal to unity, and in the hyperbola
greater than unity. The ellipse and hyperbola have each
two foci, and two corresponding directrixes, and the
parabola has one focus and one directrix. In the
ellipse the sum of the two lines from any point of the
curve to the two foci is constant; that is: AG + GB =
AH + HB; and in the hyperbola the difference of the
corresponding lines is constant. The diameter which
passes through the foci of the ellipse is the major
axis. The diameter which being produced passes through
the foci of the hyperbola is the transverse axis. The
middle point of the major or the transverse axis is the
center of the curve. Certain other curves, as the
lemniscate and the Cartesian ovals, have points called
foci, possessing properties similar to those of the
foci of conic sections. In an ellipse, rays of light
coming from one focus, and reflected from the curve,
proceed in lines directed toward the other; in an
hyperbola, in lines directed from the other; in a
parabola, rays from the focus, after reflection at the
curve, proceed in lines parallel to the axis. Thus rays
from A in the ellipse are reflected to B; rays from A
in the hyperbola are reflected toward L and M away from
B.
[1913 Webster]
3. A central point; a point of concentration.
[1913 Webster]
Aplanatic focus. (Opt.) See under Aplanatic.
Conjugate focus (Opt.), the focus for rays which have a
sensible divergence, as from a near object; -- so called
because the positions of the object and its image are
interchangeable.
Focus tube (Phys.), a vacuum tube for R[oe]ntgen rays in
which the cathode rays are focused upon the anticathode,
for intensifying the effect.
Principal focus, or Solar focus (Opt.), the focus for
parallel rays.
[1913 Webster] |
Focus tube
(gcide) | Focus \Fo"cus\ (f[=o]"k[u^]s), n.; pl. E. Focuses
(f[=o]"k[u^]s*[e^]z), L. Foci (f[=o]"s[imac]). [L. focus
hearth, fireplace; perh. akin to E. bake. Cf. Curfew,
Fuel, Fusil the firearm.]
1. (Opt.) A point in which the rays of light meet, after
being reflected or refracted, and at which the image is
formed; as, the focus of a lens or mirror.
[1913 Webster]
2. (Geom.) A point so related to a conic section and certain
straight line called the directrix that the ratio of the
distance between any point of the curve and the focus to
the distance of the same point from the directrix is
constant.
[1913 Webster]
Note: Thus, in the ellipse FGHKLM, A is the focus and CD the
directrix, when the ratios FA:FE, GA:GD, MA:MC, etc.,
are all equal. So in the hyperbola, A is the focus and
CD the directrix when the ratio HA:HK is constant for
all points of the curve; and in the parabola, A is the
focus and CD the directrix when the ratio BA:BC is
constant. In the ellipse this ratio is less than unity,
in the parabola equal to unity, and in the hyperbola
greater than unity. The ellipse and hyperbola have each
two foci, and two corresponding directrixes, and the
parabola has one focus and one directrix. In the
ellipse the sum of the two lines from any point of the
curve to the two foci is constant; that is: AG + GB =
AH + HB; and in the hyperbola the difference of the
corresponding lines is constant. The diameter which
passes through the foci of the ellipse is the major
axis. The diameter which being produced passes through
the foci of the hyperbola is the transverse axis. The
middle point of the major or the transverse axis is the
center of the curve. Certain other curves, as the
lemniscate and the Cartesian ovals, have points called
foci, possessing properties similar to those of the
foci of conic sections. In an ellipse, rays of light
coming from one focus, and reflected from the curve,
proceed in lines directed toward the other; in an
hyperbola, in lines directed from the other; in a
parabola, rays from the focus, after reflection at the
curve, proceed in lines parallel to the axis. Thus rays
from A in the ellipse are reflected to B; rays from A
in the hyperbola are reflected toward L and M away from
B.
[1913 Webster]
3. A central point; a point of concentration.
[1913 Webster]
Aplanatic focus. (Opt.) See under Aplanatic.
Conjugate focus (Opt.), the focus for rays which have a
sensible divergence, as from a near object; -- so called
because the positions of the object and its image are
interchangeable.
Focus tube (Phys.), a vacuum tube for R[oe]ntgen rays in
which the cathode rays are focused upon the anticathode,
for intensifying the effect.
Principal focus, or Solar focus (Opt.), the focus for
parallel rays.
[1913 Webster] |
Focused
(gcide) | Focus \Fo"cus\, v. t. [imp. & p. p. Focused; p. pr. & vb. n.
Focusing.]
To bring to a focus; to focalize; as, to focus a camera. --R.
Hunt.
[1913 Webster]focused \focused\ adj. [Also spelled focussed.]
1. being in focus or brought into focus; clearly delineated;
-- of an image. Opposite of unfocused.
[WordNet 1.5]
2. converging on a point; -- of light rays; as, focused light
rays can set something afire.
[WordNet 1.5]
3. concentrated on or clustered around a central point or
purpose.
Syn: centered, centred, centralized.
[WordNet 1.5]concentrated \concentrated\ adj.
1. Having a high density of (the indicated substance); as, a
narrow thread of concentrated ore.
Note: [Narrower terms: undiluted (vs. diluted)]
[WordNet 1.5]
2. Gathered together or made less diffuse; as, their
concentrated efforts; his concentrated attention. Opposite
of distributed or diffused.
Note: [Narrower terms: bunched, bunchy, clustered;
centered, centred, centralized, focused;
undivided] [Also See: compact.]
[WordNet 1.5]
3. Intense; in an extreme degree; -- of mental phenomena; as,
her concentrated passion held them at bay.
[WordNet 1.5]
4. being the most concentrated solution possible at a given
temperature; unable to dissolve still more of a substance.
Opposite of dilute or unsaturated.
Note: [Narrower terms: supersaturated]
Syn: saturated.
[WordNet 1.5]
5. reduced to a stronger or more concentrated form; as,
concentrated sulfuric acid. Opposite of diluted.
Syn: condensed.
[WordNet 1.5]
6. characterized by intensity; especially when imposed from
without; -- of actions; as, concentrated study.
Syn: intensive.
[WordNet 1.5]
7. characterized by mental concentration.
Syn: intent.
[WordNet 1.5 +PJC] |
focused
(gcide) | Focus \Fo"cus\, v. t. [imp. & p. p. Focused; p. pr. & vb. n.
Focusing.]
To bring to a focus; to focalize; as, to focus a camera. --R.
Hunt.
[1913 Webster]focused \focused\ adj. [Also spelled focussed.]
1. being in focus or brought into focus; clearly delineated;
-- of an image. Opposite of unfocused.
[WordNet 1.5]
2. converging on a point; -- of light rays; as, focused light
rays can set something afire.
[WordNet 1.5]
3. concentrated on or clustered around a central point or
purpose.
Syn: centered, centred, centralized.
[WordNet 1.5]concentrated \concentrated\ adj.
1. Having a high density of (the indicated substance); as, a
narrow thread of concentrated ore.
Note: [Narrower terms: undiluted (vs. diluted)]
[WordNet 1.5]
2. Gathered together or made less diffuse; as, their
concentrated efforts; his concentrated attention. Opposite
of distributed or diffused.
Note: [Narrower terms: bunched, bunchy, clustered;
centered, centred, centralized, focused;
undivided] [Also See: compact.]
[WordNet 1.5]
3. Intense; in an extreme degree; -- of mental phenomena; as,
her concentrated passion held them at bay.
[WordNet 1.5]
4. being the most concentrated solution possible at a given
temperature; unable to dissolve still more of a substance.
Opposite of dilute or unsaturated.
Note: [Narrower terms: supersaturated]
Syn: saturated.
[WordNet 1.5]
5. reduced to a stronger or more concentrated form; as,
concentrated sulfuric acid. Opposite of diluted.
Syn: condensed.
[WordNet 1.5]
6. characterized by intensity; especially when imposed from
without; -- of actions; as, concentrated study.
Syn: intensive.
[WordNet 1.5]
7. characterized by mental concentration.
Syn: intent.
[WordNet 1.5 +PJC] |
focused vs unfocused focussed
(gcide) | adjusted \adjusted\ adj.
1. 1 accommodated to certain requirements
Syn: regulated
[WordNet 1.5]
2. 1 having become accustomed [to surroundings, a situation.
etc.] [Narrower terms: {oriented (vs. unoriented),
orientated ]
Syn: familiarized
[WordNet 1.5]
3. 1 (Music) so tuned as to allow modulation into other keys
[Narrower terms: tempered (vs. untempered)]
Syn: tuned
[WordNet 1.5]
4. adjusted to produce a clear image; -- of an optical system
(e.g. eye or opera glasses) [Narrower terms: {focused (vs.
unfocused), focussed ] WordNet 1.5] |
Focuses
(gcide) | Focus \Fo"cus\ (f[=o]"k[u^]s), n.; pl. E. Focuses
(f[=o]"k[u^]s*[e^]z), L. Foci (f[=o]"s[imac]). [L. focus
hearth, fireplace; perh. akin to E. bake. Cf. Curfew,
Fuel, Fusil the firearm.]
1. (Opt.) A point in which the rays of light meet, after
being reflected or refracted, and at which the image is
formed; as, the focus of a lens or mirror.
[1913 Webster]
2. (Geom.) A point so related to a conic section and certain
straight line called the directrix that the ratio of the
distance between any point of the curve and the focus to
the distance of the same point from the directrix is
constant.
[1913 Webster]
Note: Thus, in the ellipse FGHKLM, A is the focus and CD the
directrix, when the ratios FA:FE, GA:GD, MA:MC, etc.,
are all equal. So in the hyperbola, A is the focus and
CD the directrix when the ratio HA:HK is constant for
all points of the curve; and in the parabola, A is the
focus and CD the directrix when the ratio BA:BC is
constant. In the ellipse this ratio is less than unity,
in the parabola equal to unity, and in the hyperbola
greater than unity. The ellipse and hyperbola have each
two foci, and two corresponding directrixes, and the
parabola has one focus and one directrix. In the
ellipse the sum of the two lines from any point of the
curve to the two foci is constant; that is: AG + GB =
AH + HB; and in the hyperbola the difference of the
corresponding lines is constant. The diameter which
passes through the foci of the ellipse is the major
axis. The diameter which being produced passes through
the foci of the hyperbola is the transverse axis. The
middle point of the major or the transverse axis is the
center of the curve. Certain other curves, as the
lemniscate and the Cartesian ovals, have points called
foci, possessing properties similar to those of the
foci of conic sections. In an ellipse, rays of light
coming from one focus, and reflected from the curve,
proceed in lines directed toward the other; in an
hyperbola, in lines directed from the other; in a
parabola, rays from the focus, after reflection at the
curve, proceed in lines parallel to the axis. Thus rays
from A in the ellipse are reflected to B; rays from A
in the hyperbola are reflected toward L and M away from
B.
[1913 Webster]
3. A central point; a point of concentration.
[1913 Webster]
Aplanatic focus. (Opt.) See under Aplanatic.
Conjugate focus (Opt.), the focus for rays which have a
sensible divergence, as from a near object; -- so called
because the positions of the object and its image are
interchangeable.
Focus tube (Phys.), a vacuum tube for R[oe]ntgen rays in
which the cathode rays are focused upon the anticathode,
for intensifying the effect.
Principal focus, or Solar focus (Opt.), the focus for
parallel rays.
[1913 Webster] |
Focusing
(gcide) | Focus \Fo"cus\, v. t. [imp. & p. p. Focused; p. pr. & vb. n.
Focusing.]
To bring to a focus; to focalize; as, to focus a camera. --R.
Hunt.
[1913 Webster]focusing \focusing\, focussing \focussing\n.
1. the concentration of attention or energy on something.
Syn: focus, focussing.
[WordNet 1.5]
2. the act of bringing into focus.
Syn: focalization, focalisation.
[WordNet 1.5] |
focusing
(gcide) | Focus \Fo"cus\, v. t. [imp. & p. p. Focused; p. pr. & vb. n.
Focusing.]
To bring to a focus; to focalize; as, to focus a camera. --R.
Hunt.
[1913 Webster]focusing \focusing\, focussing \focussing\n.
1. the concentration of attention or energy on something.
Syn: focus, focussing.
[WordNet 1.5]
2. the act of bringing into focus.
Syn: focalization, focalisation.
[WordNet 1.5] |
focussed
(gcide) | focused \focused\ adj. [Also spelled focussed.]
1. being in focus or brought into focus; clearly delineated;
-- of an image. Opposite of unfocused.
[WordNet 1.5]
2. converging on a point; -- of light rays; as, focused light
rays can set something afire.
[WordNet 1.5]
3. concentrated on or clustered around a central point or
purpose.
Syn: centered, centred, centralized.
[WordNet 1.5]focussed \focussed\ adj.
1. same as focused (in all senses).
Syn: focused.
[WordNet 1.5] focusing |
focussing
(gcide) | focusing \focusing\, focussing \focussing\n.
1. the concentration of attention or energy on something.
Syn: focus, focussing.
[WordNet 1.5]
2. the act of bringing into focus.
Syn: focalization, focalisation.
[WordNet 1.5] |
Principal focus
(gcide) | Focus \Fo"cus\ (f[=o]"k[u^]s), n.; pl. E. Focuses
(f[=o]"k[u^]s*[e^]z), L. Foci (f[=o]"s[imac]). [L. focus
hearth, fireplace; perh. akin to E. bake. Cf. Curfew,
Fuel, Fusil the firearm.]
1. (Opt.) A point in which the rays of light meet, after
being reflected or refracted, and at which the image is
formed; as, the focus of a lens or mirror.
[1913 Webster]
2. (Geom.) A point so related to a conic section and certain
straight line called the directrix that the ratio of the
distance between any point of the curve and the focus to
the distance of the same point from the directrix is
constant.
[1913 Webster]
Note: Thus, in the ellipse FGHKLM, A is the focus and CD the
directrix, when the ratios FA:FE, GA:GD, MA:MC, etc.,
are all equal. So in the hyperbola, A is the focus and
CD the directrix when the ratio HA:HK is constant for
all points of the curve; and in the parabola, A is the
focus and CD the directrix when the ratio BA:BC is
constant. In the ellipse this ratio is less than unity,
in the parabola equal to unity, and in the hyperbola
greater than unity. The ellipse and hyperbola have each
two foci, and two corresponding directrixes, and the
parabola has one focus and one directrix. In the
ellipse the sum of the two lines from any point of the
curve to the two foci is constant; that is: AG + GB =
AH + HB; and in the hyperbola the difference of the
corresponding lines is constant. The diameter which
passes through the foci of the ellipse is the major
axis. The diameter which being produced passes through
the foci of the hyperbola is the transverse axis. The
middle point of the major or the transverse axis is the
center of the curve. Certain other curves, as the
lemniscate and the Cartesian ovals, have points called
foci, possessing properties similar to those of the
foci of conic sections. In an ellipse, rays of light
coming from one focus, and reflected from the curve,
proceed in lines directed toward the other; in an
hyperbola, in lines directed from the other; in a
parabola, rays from the focus, after reflection at the
curve, proceed in lines parallel to the axis. Thus rays
from A in the ellipse are reflected to B; rays from A
in the hyperbola are reflected toward L and M away from
B.
[1913 Webster]
3. A central point; a point of concentration.
[1913 Webster]
Aplanatic focus. (Opt.) See under Aplanatic.
Conjugate focus (Opt.), the focus for rays which have a
sensible divergence, as from a near object; -- so called
because the positions of the object and its image are
interchangeable.
Focus tube (Phys.), a vacuum tube for R[oe]ntgen rays in
which the cathode rays are focused upon the anticathode,
for intensifying the effect.
Principal focus, or Solar focus (Opt.), the focus for
parallel rays.
[1913 Webster] |
Solar focus
(gcide) | Focus \Fo"cus\ (f[=o]"k[u^]s), n.; pl. E. Focuses
(f[=o]"k[u^]s*[e^]z), L. Foci (f[=o]"s[imac]). [L. focus
hearth, fireplace; perh. akin to E. bake. Cf. Curfew,
Fuel, Fusil the firearm.]
1. (Opt.) A point in which the rays of light meet, after
being reflected or refracted, and at which the image is
formed; as, the focus of a lens or mirror.
[1913 Webster]
2. (Geom.) A point so related to a conic section and certain
straight line called the directrix that the ratio of the
distance between any point of the curve and the focus to
the distance of the same point from the directrix is
constant.
[1913 Webster]
Note: Thus, in the ellipse FGHKLM, A is the focus and CD the
directrix, when the ratios FA:FE, GA:GD, MA:MC, etc.,
are all equal. So in the hyperbola, A is the focus and
CD the directrix when the ratio HA:HK is constant for
all points of the curve; and in the parabola, A is the
focus and CD the directrix when the ratio BA:BC is
constant. In the ellipse this ratio is less than unity,
in the parabola equal to unity, and in the hyperbola
greater than unity. The ellipse and hyperbola have each
two foci, and two corresponding directrixes, and the
parabola has one focus and one directrix. In the
ellipse the sum of the two lines from any point of the
curve to the two foci is constant; that is: AG + GB =
AH + HB; and in the hyperbola the difference of the
corresponding lines is constant. The diameter which
passes through the foci of the ellipse is the major
axis. The diameter which being produced passes through
the foci of the hyperbola is the transverse axis. The
middle point of the major or the transverse axis is the
center of the curve. Certain other curves, as the
lemniscate and the Cartesian ovals, have points called
foci, possessing properties similar to those of the
foci of conic sections. In an ellipse, rays of light
coming from one focus, and reflected from the curve,
proceed in lines directed toward the other; in an
hyperbola, in lines directed from the other; in a
parabola, rays from the focus, after reflection at the
curve, proceed in lines parallel to the axis. Thus rays
from A in the ellipse are reflected to B; rays from A
in the hyperbola are reflected toward L and M away from
B.
[1913 Webster]
3. A central point; a point of concentration.
[1913 Webster]
Aplanatic focus. (Opt.) See under Aplanatic.
Conjugate focus (Opt.), the focus for rays which have a
sensible divergence, as from a near object; -- so called
because the positions of the object and its image are
interchangeable.
Focus tube (Phys.), a vacuum tube for R[oe]ntgen rays in
which the cathode rays are focused upon the anticathode,
for intensifying the effect.
Principal focus, or Solar focus (Opt.), the focus for
parallel rays.
[1913 Webster] |
unfocused unfocussed
(gcide) | distributed \distributed\ adj.
1. spread from a central location to multiple points or
recipients. Opposite of concentrated. [Narrower terms:
{apportioned, dealt out, doled out, meted out, parceled
out}; diffuse, diffused; dispensed; {dispersed,
spread}; {divided, divided up, shared, shared out on the
basis of a plan or purpose)}; encyclical; rationed;
scattered, widespread; sparse, thin; {unfocused,
unfocussed}] Also See: distributive.
[WordNet 1.5 +PJC]
2. spread among a variety of securities; -- of investments.
Syn: diversified.
[WordNet 1.5]
Distributing to the necessity of saints. --Rom.
xii. 13.
[1913 Webster] |
Virtual focus
(gcide) | Virtual \Vir"tu*al\ (?; 135), a. [Cf. F. virtuel. See Virtue.]
1. Having the power of acting or of invisible efficacy
without the agency of the material or sensible part;
potential; energizing.
[1913 Webster]
Heat and cold have a virtual transition, without
communication of substance. --Bacon.
[1913 Webster]
Every kind that lives,
Fomented by his virtual power, and warmed. --Milton.
[1913 Webster]
2. Being in essence or effect, not in fact; as, the virtual
presence of a man in his agent or substitute.
[1913 Webster]
A thing has a virtual existence when it has all the
conditions necessary to its actual existence.
--Fleming.
[1913 Webster]
To mask by slight differences in the manners a
virtual identity in the substance. --De Quincey.
[1913 Webster]
Principle of virtual velocities (Mech.), the law that when
several forces are in equilibrium, the algebraic sum of
their virtual moments is equal to zero.
Virtual focus (Opt.), the point from which rays, having
been rendered divergent by reflection of refraction,
appear to issue; the point at which converging rays would
meet if not reflected or refracted before they reach it.
Virtual image. (Optics) See under Image.
Virtual moment (of a force) (Mech.), the product of the
intensity of the force multiplied by the virtual velocity
of its point of application; -- sometimes called {virtual
work}.
Virtual velocity (Mech.), a minute hypothetical
displacement, assumed in analysis to facilitate the
investigation of statical problems. With respect to any
given force of a number of forces holding a material
system in equilibrium, it is the projection, upon the
direction of the force, of a line joining its point of
application with a new position of that point indefinitely
near to the first, to which the point is conceived to have
been moved, without disturbing the equilibrium of the
system, or the connections of its parts with each other.
Strictly speaking, it is not a velocity but a length.
Virtual work. (Mech.) See Virtual moment, above.
[1913 Webster] |
autofocus
(wn) | autofocus
n 1: an optical device for focussing a camera or other
instrument automatically |
focus
(wn) | focus
n 1: the concentration of attention or energy on something; "the
focus of activity shifted to molecular biology"; "he had no
direction in his life" [syn: focus, focusing,
focussing, focal point, direction, centering]
2: maximum clarity or distinctness of an image rendered by an
optical system; "in focus"; "out of focus"
3: maximum clarity or distinctness of an idea; "the controversy
brought clearly into focus an important difference of
opinion"
4: a central point or locus of an infection in an organism; "the
focus of infection" [syn: focus, focal point, nidus]
5: special emphasis attached to something; "the stress was more
on accuracy than on speed" [syn: stress, focus]
6: a point of convergence of light (or other radiation) or a
point from which it diverges [syn: focus, focal point]
7: a fixed reference point on the concave side of a conic
section
v 1: direct one's attention on something; "Please focus on your
studies and not on your hobbies" [syn: concentrate,
focus, center, centre, pore, rivet]
2: cause to converge on or toward a central point; "Focus the
light on this image" [ant: blur]
3: bring into focus or alignment; to converge or cause to
converge; of ideas or emotions [syn: concenter,
concentre, focalize, focalise, focus]
4: become focussed or come into focus; "The light focused" [syn:
focus, focalize, focalise] [ant: blur, dim, slur]
5: put (an image) into focus; "Please focus the image; we cannot
enjoy the movie" [syn: focus, focalize, focalise,
sharpen] [ant: blear, blur] |
focus on
(wn) | focus on
v 1: center upon; "Her entire attention centered on her
children"; "Our day revolved around our work" [syn: {focus
on}, center on, revolve around, revolve about,
concentrate on, center] |
focused
(wn) | focused
adj 1: being in focus or brought into focus [syn: focused,
focussed] [ant: unfocused, unfocussed]
2: (of light rays) converging on a point; "focused light rays
can set something afire" [syn: focused, focussed]
3: of an optical system (e.g. eye or opera glasses) adjusted to
produce a clear image |
focusing
(wn) | focusing
n 1: the concentration of attention or energy on something; "the
focus of activity shifted to molecular biology"; "he had no
direction in his life" [syn: focus, focusing,
focussing, focal point, direction, centering]
2: the act of bringing into focus [syn: focalization,
focalisation, focusing] |
focussed
(wn) | focussed
adj 1: being in focus or brought into focus [syn: focused,
focussed] [ant: unfocused, unfocussed]
2: (of light rays) converging on a point; "focused light rays
can set something afire" [syn: focused, focussed] |
focussing
(wn) | focussing
n 1: the concentration of attention or energy on something; "the
focus of activity shifted to molecular biology"; "he had no
direction in his life" [syn: focus, focusing,
focussing, focal point, direction, centering] |
refocus
(wn) | refocus
v 1: focus once again; The physicist refocused the light beam"
2: focus anew; "The group needs to refocus its goals"
3: put again into focus or focus more sharply; "refocus the
image until it is very sharp" |
refocusing
(wn) | refocusing
n 1: focusing again |
unfocused
(wn) | unfocused
adj 1: (of an image) not being in or brought into focus; "at
their edges things were pretty much out of focus" [syn:
unfocused, unfocussed] [ant: focused, focussed]
2: not concentrated at one point or upon one objective;
"diversity...in our huge unfocused country"- Owen Wister
[syn: unfocused, unfocussed] |
unfocussed
(wn) | unfocussed
adj 1: (of an image) not being in or brought into focus; "at
their edges things were pretty much out of focus" [syn:
unfocused, unfocussed] [ant: focused, focussed]
2: not concentrated at one point or upon one objective;
"diversity...in our huge unfocused country"- Owen Wister
[syn: unfocused, unfocussed] |
focus
(foldoc) | FOCUS
A hierarchical database language from
Information Builders, Inc.
(1994-12-21)
|
focus group
(foldoc) | focus group
An event where market researchers meet (potential)
users of a product to try to plan how to improve it.
(1999-02-24)
|
|