English definition of Lens

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Definition of lens

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Lens (n.) A piece of glass, or other transparent substance, ground with two opposite regular surfaces, either both curved, or one curved and the other plane, and commonly used, either singly or combined, in optical instruments, for changing the direction of rays of light, and thus magnifying objects, or otherwise modifying vision. In practice, the curved surfaces are usually spherical, though rarely cylindrical, or of some other figure..

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Biconvex :: Biconvex (a.) Convex on both sides; as, a biconvex lens..

Specular :: Specular (a.) Assisting sight, as a lens or the like..

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..

Case :: Case (n.) One of the forms, or the inflections or changes of form, of a noun, pronoun, or adjective, which indicate its relation to other words, and in the aggregate constitute its declension; the relation which a noun or pronoun sustains to some other word..

Altiscope :: Altiscope (n.) An arrangement of lenses and mirrors which enables a person to see an object in spite of intervening objects.

Fresnel Lens :: Fresnel lens () See under Lens.

Rutin :: Rutin (n.) A glucoside resembling, but distinct from, quercitrin. Rutin is found in the leaves of the rue (Ruta graveolens) and other plants, and obtained as a bitter yellow crystalline substance which yields quercitin on decomposition..

Ghost :: Ghost (n.) A false image formed in a telescope by reflection from the surfaces of one or more lenses.

Stronghand :: Strong (superl.) Applied to forms in Anglo-Saxon, etc., which retain the old declensional endings. In the Teutonic languages the vowel stems have held the original endings most firmly, and are called strong; the stems in -n are called weak other constant stems conform, or are irregular..

Couching :: Couching (n.) The operation of putting down or displacing the opaque lens in cataract.

Amasthenic :: Amasthenic (a.) Uniting the chemical rays of light into one focus, as a certain kind of lens; amacratic..

Fall :: Fall (n.) Lapse or declension from innocence or goodness. Specifically: The first apostasy; the act of our first parents in eating the forbidden fruit; also, the apostasy of the rebellious angels..

Diacaustic :: Diacaustic (n.) That which burns by refraction, as a double convex lens, or the sun's rays concentrated by such a lens, sometimes used as a cautery..

Mercer :: Mercer (n.) Originally, a dealer in any kind of goods or wares; now restricted to a dealer in textile fabrics, as silks or woolens..

Collimator :: Collimator (n.) A tube having a convex lens at one end and at the other a small opening or slit which is at the principal focus of the lens, used for producing a beam of parallel rays; also, a lens so used..

Divergent :: Divergent (a.) Causing divergence of rays; as, a divergent lens..

Spherometer :: Spherometer (n.) An instrument for measuring the curvature of spherical surface, as of lenses for telescope, etc..

Chromatism :: Chromatism (n.) The state of being colored, as in the case of images formed by a lens..

Achromatism :: Achromatism (n.) The state or quality of being achromatic; as, the achromatism of a lens; achromaticity..

Plano-concave :: Plano-concave (a.) Plane or flat on one side, and concave on the other; as, a plano-concave lens. See Lens..