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111Focal surface — For a surface in three dimension the focal surface, surface of centers or evolute is formed by taking the centers of the curvature spheres, which are the tangential spheres whose radii are the reciprocals of one of the principal curvatures at the …
112The Dark Energy Survey — DES logo The Dark Energy Survey (DES) is a survey that aims to probe the dynamics of the expansion of the universe and the growth of large scale structure. The collaboration is composed of research institutes and universities from United… …
113Point Iroquois Light — Infobox Lighthouse caption = Point Iroquois light historical U.S.C.G. photo location = Whitefish Bay, Michigan coordinates = coord|46|29.021|N|84|37.541|W| yearlit = 1870 automated = yeardeactivated = 1963 foundation = Cement construction = Brick …
114Focal-plane shutter — In camera design, a focal plane shutter is a type of photographic shutter that is positioned immediately in front of the focal plane of the camera, that is, right in front of the photographic film or image sensor. AdvantagesOne of the main… …
115point — I n. location, position, place, spot 1) to arrive at, reach a point 2) an assembly; cutoff; focal; jumping off; pressure; rallying; salient; starting; turning; vanishing; vantage point 3) the point of no return 4) at a point (at that point in… …
116Focal cloud — A focal cloud is the collection of focal points of any imperfect lens,whether optical, electrostatic or electromagnetic. This includes Parabolic antennas and lens type reflective antennas of all kinds.In this focal cloud illustration, a perfect… …
117focal distance — noun the distance from a lens to its focus • Syn: ↑focal length • Hypernyms: ↑distance * * * focal distance noun Focal length • • • Main Entry: ↑focus * * * …
118focal length — F/A/V abbreviated as FL, it is the distance, in millimeters, between the center of a lens and the point where the image comes into focus. The value given to a lens, stated in inches or millimeters. The shorter the focal length, the wider the… …
119focal — [[t]fo͟ʊk(ə)l[/t]] 1) ADJ: ADJ n Focal is used to describe something that relates to the point where a number of rays or lines meet. ...the focal plane of the telescope. 2) ADJ: ADJ n Focal is used to describe something that is very important.… …
120point */*/*/ — I UK [pɔɪnt] / US noun Word forms point : singular point plural points 1) [countable] an idea or opinion among a number of others I disagree with you on a couple of important points. point by point (= looking at each part separately): Let s go… …
