aspherical surface

См. также в других словарях:

• Aspherical space — In topology, an aspherical space is a topological space with all higher homotopy groups equal to {0}. If one works with CW complexes, one can reformulate this condition: an aspherical CW complex is a CW complex whose universal cover is… …   Wikipedia

• aspherical — /ay sfer i keuhl/, adj. Optics. (of a reflecting surface or lens) deviating slightly from a perfectly spherical shape and relatively free from aberrations. Also, aspheric. [1920 25; A 6 + SPHERICAL] * * * …   Universalium

• aspherical — a•spher•i•cal [[t]eɪˈsfɛr ɪ kəl, eɪˈsfɪər [/t]] also a•spher′ic adj. opt (of a reflecting surface or lens) deviating slightly from a perfectly spherical shape and relatively free from aberrations • Etymology: 1920–25 …   From formal English to slang

• 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

• Canon FD lens mount — The Canon FD lens mount is a physical standard for connecting a photographic lens to a single lens reflex camera body. The standard was developed by Canon of Japan and was introduced in March 1971 with the Canon F 1 camera. It was the primary… …   Wikipedia

• History of the single-lens reflex camera — The history of the single lens reflex camera predates the invention of photography in 1826/27 by one and a half centuries with the use of a reflex mirror in a camera obscura first described in 1676. Such SLR devices were popular as drawing aids… …   Wikipedia

• Cirrus cloud — A sky filled with many types of cirrus clouds Cirrus clouds (cloud classification symbol: Ci) are atmospheric clouds generally characterized by thin, wispy strands, giving them their name from the Latin word cirrus meaning a ringlet or curling… …   Wikipedia

• Photographic lens — A photographic lens (also known as objective lens or photographic objective) is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media… …   Wikipedia

• Small cancellation theory — In the mathematical subject of group theory, small cancellation theory studies groups given by group presentations satisfying small cancellation conditions, that is where defining relations have small overlaps with each other. It turns out that… …   Wikipedia

• Corrective lens — A bifocal corrective eyeglass lens A pair of contact le …   Wikipedia

• Seifert fiber space — A Seifert fiber space is a 3 manifold together with a nice decomposition as a disjoint union of circles. In other words it is a S^1 bundle (circle bundle) over a 2 dimensional orbifold. Most small 3 manifolds are Seifert fiber spaces, and they… …   Wikipedia