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What is the meaning of FOC. Phrases containing FOC
See meanings and uses of FOC!FOC
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FOC
FOC
The line drawn through a focus of a conic section parallel to the directrix and terminated both ways by the curve. It is the parameter of the principal axis. See Focus, and Parameter.
FOC
n.
A condition of the eye in which, through shortness of the eyeball or fault of the refractive media, the rays of light come to a focus behind the retina; farsightedness; -- called also hyperopia. Cf. Emmetropia.
n.
A convex lens of glass for producing heat by converging the sun's rays into a focus.
v. t.
To bring to a focus; to focalize; as, to focus a camera.
p. pr. & vb. n.
of Focus
imp. & p. p.
of Focalize
n.
The act of focalizing or bringing to a focus, or the state of being focalized.
p. pr. & vb. n.
of Focalize
n.
The reciprocal of the focal distance of a lens, used as measure of the divergence or convergence of a pencil of rays.
imp. & p. p.
of Focus
n.
A curve formed by a section of a cone, when the cutting plane makes a greater angle with the base than the side of the cone makes. It is a plane curve such that the difference of the distances from any point of it to two fixed points, called foci, is equal to a given distance. See Focus. If the cutting plane be produced so as to cut the opposite cone, another curve will be formed, which is also an hyperbola. Both curves are regarded as branches of the same hyperbola. See Illust. of Conic section, and Focus.
n.
An assisting instrument for focusing an object in or before a camera.
n.
A point so related to a conic section and certain straight line called the directrix that the ratio of the distace between any point of the curve and the focus to the distance of the same point from the directrix is constant.
n.
A point in which the rays of light meet, after being reflected or refrcted, and at which the image is formed; as, the focus of a lens or mirror.
a.
Belonging to,or concerning, a focus; as, a focal point.
pl.
of Focus
n.
An instrument for measuring the limits of distincts vision in different individuals, and thus determiming the proper focal length of a lens for correcting imperfect sight.
n.
One of foci of an ellipse, or other curve.
v. t.
To bring to a focus; to focus; to concentrate.
pl.
of Focus
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