What is the meaning of FOCAL. Phrases containing FOCAL
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FOCAL
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FOCAL
n.
The act of focalizing or bringing to a focus, or the state of being focalized.
a.
Specifically, having such a combination of concave and convex sides as makes the focal axis the shortest line between them. See Illust. under Lens.
n.
A defect of the eye or of a lens, in consequence of which the rays derived from one point are not brought to a single focal point, thus causing imperfect images or indistinctness of vision.
n.
The reciprocal of the focal distance of a lens, used as measure of the divergence or convergence of a pencil of rays.
p. pr. & vb. n.
of Focalize
n.
A lens or mirror, usually of short focal distance, used to concentrate light upon an object.
v. t.
To bring to a focus; to focalize; as, to focus a camera.
v. t.
To bring to a focus; to focus; to concentrate.
n.
A unit employed by oculists in numbering glasses according to the metric system; a refractive power equal to that of a glass whose principal focal distance is one meter.
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.
imp. & p. p.
of Focalize
a.
Belonging to,or concerning, a focus; as, a focal point.
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