- crown lens
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a lens made of crown glass, usually used as the converging lens component of an achromatic lens.[1825-35]
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Universalium. 2010.
crown lens
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crown lens — n. a lens made of crown glass; specif., the convex member of an achromatic lens … English World dictionary
crown lens — noun a lens made of optical crown glass • Hypernyms: ↑lens, ↑lense, ↑lens system * * * noun : the crown glass component of an achromatic lens * * * Optics. a lens made of crown glass, usually used as the converging lens component of an achromatic … Useful english dictionary
lens system — noun a transparent optical device used to converge or diverge transmitted light and to form images • Syn: ↑lens, ↑lense • Hypernyms: ↑optical device • Hyponyms: ↑anastigmat, ↑anastigmatic lens, ↑ … Useful english dictionary
crown glass — noun 1. a glass blown into a globe which is later flattened and spun to form a disk • Hypernyms: ↑glass 2. optical glass of low dispersion and low refractive index • Syn: ↑optical crown, ↑optical crown glass • Hypernyms: ↑optical glass … Useful english dictionary
Crown Point Light — pre 1926 photograph of present Crown Point Light, showing attached keeper s house (USCG) Location on Crown Point on Lake Champlain Coordinates … Wikipedia
Lens clock — A lens clock is a mechanical dial caliper that is used to measure dioptric power of a lens. It is a specialized version of a spherometer. A lens clock measures the curvature of a surface, but gives the result in diopters, assuming the lens is… … Wikipedia
Crown glass (optics) — This article is about crown glass as used in optics. For the window glass, see Crown glass (window). Crown glass is type of optical glass used in lenses and other optical components. It has relatively low refractive index (≈1.52) and low… … Wikipedia
Crown glass — Glass Glass (gl[.a]s), n. [OE. glas, gles, AS. gl[ae]s; akin to D., G., Dan., & Sw. glas, Icel. glas, gler, Dan. glar; cf. AS. gl[ae]r amber, L. glaesum. Cf. {Glare}, n., {Glaze}, v. t.] [1913 Webster] 1. A hard, brittle, translucent, and… … The Collaborative International Dictionary of English
Achromatic lens — An achromatic lens or achromat is a lens that is designed to limit the effects of chromatic and spherical aberration. Achromatic lenses are corrected to bring two wavelengths (typically red and blue) into focus in the same plane.The most common… … Wikipedia
achromatic lens — Optics. a system of two or more lenses that is substantially free from chromatic aberration and in which the lenses are made of different substances so that the focal length of the system is the same for two or three wavelengths of light. Also… … Universalium
