light focusing

  • 121Refractive index — Refraction of light at the interface between two media. In optics the refractive index or index of refraction of a substance or medium is a measure of the speed of light in that medium. It is expressed as a ratio of the speed of light in vacuum… …

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  • 122Epicureanism — is a system of philosophy based upon the teachings of Epicurus ( c . 341 ndash; c . 270 BC), founded around 307 BC. Epicurus was an atomic materialist, following in the steps of Democritus. His materialism led him to a general attack on… …

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  • 123Color television — Title card for NBC, promoting their broadcast in RCA color . Color television is part of the history of television, the technology of television and practices associated with television s transmission of moving images in color video. In its most… …

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  • 124Street photography — is a type of documentary photography that features subjects in candid situations within public places such as streets, parks, beaches, malls, political conventions, and other settings. Overview Street photography uses the techniques of straight… …

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  • 125Pentax K1000 — The Pentax K1000 (originally marked the Asahi Pentax K1000) is an interchangeable lens, 35 mm film, single lens reflex (SLR) camera. It was manufactured by Asahi Optical Co., Ltd., (PENTAX Corporation since 2002) from 1976 to 1997, originally in… …

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  • 126Chazz Princeton — Infobox animanga character name = Chazz Princeton series = Yu Gi Oh! GX caption = Chazz Princeton first = Anime: Yu Gi Oh! GX Episode 1 Manga: Yu Gi Oh! GX Chapter 1 last = creator = voiced by = Taiki Matsuno (Japanese) Anthony Salerno (English)… …

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  • 127Valéry Grancher — [ [http://fr.wikipedia.org/wiki/Valery Grancher french wikipedia article ] ] french wikipedia articleValéry Grancher (born 1967 April 22 in Toulon, Var, France) is a French Internet based artist, performer, theorist, curator and lecturer.… …

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  • 128Stage lighting instrument — Stage lighting instruments are used in stage lighting to illuminate theatrical productions, rock concerts and other performances taking place in live performance venues. They are also used to light television studios and sound stages.Terminology… …

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  • 129photoreception — 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

  • 130telescope — /tel euh skohp /, n., adj., v., telescoped, telescoping. n. 1. an optical instrument for making distant objects appear larger and therefore nearer. One of the two principal forms (refracting telescope) consists essentially of an objective lens… …

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  • 131Croatian presidential election, 2009–2010 — 2005 ← 27 December 2009 and 10 January 2010 → Next …

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  • 132Panasonic Lumix DMC-GH1 — Panasonic DMC GH1K Type Micro Four Thirds System Sensor 17.3 × 13 mm Live MOS (in 4:3 aspect ratio) Maximum …

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  • 133Martial arts — For other uses, see Martial arts (disambiguation). Martial arts are extensive systems of codified practices and traditions of combat, practiced for a variety of reasons, including self defense, competition, physical health and fitness, as well as …

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  • 134Sundial — A sundial is a device that measures time by the position of the Sun. In common designs such as the horizontal sundial, the sun casts a shadow from its style (a thin rod or a sharp, straight edge) onto a flat surface marked with lines indicating… …

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  • 135Subminiature photography — is the practice of using unusually small cameras with unusually small film formats to make photographs. OverviewThe exact boundary between cameras and formats that are subminiature and those that are merely small is the subject of debate among… …

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  • 136Telescopic sight — Scope redirects here. For other uses, see Scope (disambiguation). View through a 4x rifle scope. A telescopic sight, commonly called a scope, is a sighting device that is based on an optical refracting telescope. They are equipped with some form… …

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  • 137Human eye — Infobox Anatomy Name = Eye Caption = Schematic diagram of the human eye. The human eye is similar to most mammalian eyes.Dynamic rangeThe retina has a static contrast ratio of around 100:1 (about 6 1/2 stops). As soon as the eye moves (saccades)… …

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  • 138San Diego Trolley — Current San Diego Trolley LRV Fleet Info …

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  • 139Canon T90 — The Canon T90, introduced in 1986, was the top of the line in Canon s T series of 35 mm Single lens reflex (SLR) cameras. It was the last professional level manual focus camera from Canon, and the last professional camera to use the Canon FD lens …

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  • 140Living History Australia — There are a number of Australian Living history and historical reenactment groups. The Australian Register of Living History Organisations (ARLHO) is a group that is a focal point for Living history groups and provides some information resources… …

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