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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Ophthalmoscope :: Ophthalmoscope (n.) An instrument for viewing the interior of the eye, particularly the retina. Light is thrown into the eye by a mirror (usually concave) and the interior is then examined with or without the aid of a lens..

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

Magnify :: Magnify (v. i.) To have the power of causing objects to appear larger than they really are; to increase the apparent dimensions of objects; as, some lenses magnify but little..

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

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

Piapec :: Piapec (n.) A West African pie (Ptilostomus Senegalensis).

Dermestes :: Dermestes (n.) A genus of coleopterous insects, the larvae of which feed animal substances. They are very destructive to dries meats, skins, woolens, and furs. The most common species is D. lardarius, known as the bacon beetle..

Heteroclite :: Heteroclite (n.) A word which is irregular or anomalous either in declension or conjugation, or which deviates from ordinary forms of inflection in words of a like kind; especially, a noun which is irregular in declension..

Glass :: Glass (v. t.) An optical glass; a lens; a spyglass; -- in the plural, spectacles; as, a pair of glasses; he wears glasses..

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..

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

Holophote :: Holophote (n.) A lamp with lenses or reflectors to collect the rays of light and throw them in a given direction; -- used in lighthouses.

Lenticularly :: Lenticularly (adv.) In the manner of a lens; with a curve.

Graphoscope :: Graphoscope (n.) An optical instrument for magnifying engravings, photographs, etc., usually having one large lens and two smaller ones..

Reversal :: Reversal (n.) The act of reversing; the causing to move or face in an opposite direction, or to stand or lie in an inverted position; as, the reversal of a rotating wheel; the reversal of objects by a convex lens..

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..

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

Paradigm :: Paradigm (n.) An example of a conjugation or declension, showing a word in all its different forms of inflection..

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

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