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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Flection :: Flection (n.) The variation of words by declension, comparison, or conjugation; inflection..

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..

Periscope :: Periscope (n.) an optical instrument of tubular shape containing an arrangement of lenses and mirrors (or prisms), allowing a person to observe a field of view otherwise obstructed, as beyond an obstructing object or (as in submarines) above the surface of the water..

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

Bruiser :: Bruiser (n.) A concave tool used in grinding lenses or the speculums of telescopes.

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

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..

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..

Descension :: Descension (n.) The act of going downward; descent; falling or sinking; declension; degradation.

Diaphanoscope :: Diaphanoscope (n.) A dark box constructed for viewing transparent pictures, with or without a lens..

Defective :: Defective (a.) Lacking some of the usual forms of declension or conjugation; as, a defective noun or verb..

Flexion :: Flexion (n.) Syntactical change of form of words, as by declension or conjugation; inflection..

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

Bonito :: Bonito (n.) The skipjack (Sarda Mediterranea) of the Atlantic, an important and abundant food fish on the coast of the United States, and (S. Chilensis) of the Pacific, and other related species. They are large and active fishes, of a blue color with black oblique stripes..

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..

Capsule :: Capsule (n.) A membranous sac containing fluid, or investing an organ or joint; as, the capsule of the lens of the eye. Also, a capsulelike organ..

Dry Goods :: Dry goods () A commercial name for textile fabrics, cottons, woolens, linen, silks, laces, etc., -- in distinction from groceries..

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

Spectacle :: Spectacle (n.) An optical instrument consisting of two lenses set in a light frame, and worn to assist sight, to obviate some defect in the organs of vision, or to shield the eyes from bright light..

Dill :: Dill (n.) An herb (Peucedanum graveolens), the seeds of which are moderately warming, pungent, and aromatic, and were formerly used as a soothing medicine for children; -- called also dillseed..