Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of focal is as below...

Vergency :: Vergency (n.) The reciprocal of the focal distance of a lens, used as measure of the divergence or convergence of a pencil of rays..

Focal :: Focal (a.) Belonging to,or concerning, a focus; as, a focal point..

Condenser :: Condenser (n.) A lens or mirror, usually of short focal distance, used to concentrate light upon an object..

Focalized :: Focalized (imp. & p. p.) of Focaliz.

Concavo-convex :: Concavo-convex (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..

Opsiometer :: Opsiometer (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..

Astigmatism :: Astigmatism (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..

Focus :: Focus (v. t.) To bring to a focus; to focalize; as, to focus a camera..

Dioptre :: Dioptre (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.

Focalization :: Focalization (n.) The act of focalizing or bringing to a focus, or the state of being focalized..

Focalize :: Focalize (v. t.) To bring to a focus; to focus; to concentrate.

Confocal :: Confocal (a.) Having the same foci; as, confocal quadrics..

Focalizing :: Focalizing (p. pr. & vb. n.) of Focaliz.

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