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A rough, opaque piece of glass of suitable size, design and composition for use, when ground and polished, as a multifocal lens for use in a pair of eyeglasses.
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Optical lens design — refers to the calculation of lens construction parameters (variables) that will meet a set of performance requirements and constraints, including cost and schedule limitations. Construction parameters include surface profile types (spherical,… … Wikipedia
Fresnel lens — A Fresnel lens (pronounced [ frɛz.nəl] or [freɪ nɛl] ) is a type of lens invented by French physicist Augustin Jean Fresnel. Originally developed for lighthouses, the design enables the construction of lenses of large aperture and short focal… … Wikipedia
Saison 1997-1998 du Racing Club de Lens — Racing Club de Lens Saison 1997 1998 Généralités Président … Wikipédia en Français
Aspheric lens — An aspheric lens or asphere is a lens whose surfaces have a profile that is neither a portion of a sphere nor of a circular cylinder. In photography, a lens assembly that includes an aspheric element is often called an aspherical lens.The asphere … Wikipedia
Field lens — Field Field (f[=e]ld), n. [OE. feld, fild, AS. feld; akin to D. veld, G. feld, Sw. f[ a]lt, Dan. felt, Icel. fold field of grass, AS. folde earth, land, ground, OS. folda.] 1. Cleared land; land suitable for tillage or pasture; cultivated ground; … The Collaborative International Dictionary of English
Cape Florida Light — Infobox Lighthouse caption = The Cape Florida Lighthouse location = Cape Florida at the south end of Key Biscayne coordinates = coord|25|39|59.72|N|80|09|21.47|W|region:US type:landmark yearlit = 1825 automated = yeardeactivated = 1878 foundation … Wikipedia
printing — /prin ting/, n. 1. the art, process, or business of producing books, newspapers, etc., by impression from movable types, plates, etc. 2. the act of a person or thing that prints. 3. words, symbols, etc., in printed form. 4. printed material. 5.… … Universalium
photoreception — photoreceptive, adj. /foh toh ri sep sheuhn/, n. the physiological perception of light. [1905 10; PHOTO + RECEPTION] * * * Biological responses to stimulation by light, most often referring to the mechanism of vision. In one celled organisms such … Universalium
Technicolor — This article is about the film processing trademark. For the parent company of the same name, see Technicolor SA. For other uses, see Technicolor (disambiguation). A title card for a Walt Disney Donald Duck cartoon with an in Technicolor credit.… … Wikipedia
Canon New F-1 — The Canon New F 1 replaced the F 1n (an upgraded F 1) as Canon s top of the line 35mm single lens reflex camera in 1981. Like the earlier models, the New F 1 takes FD mount lenses. Although no date has ever been confirmed, it is thought that the… … Wikipedia
