sharpness of curvature
1Curvature — In mathematics, curvature refers to any of a number of loosely related concepts in different areas of geometry. Intuitively, curvature is the amount by which a geometric object deviates from being flat, or straight in the case of a line, but this …
2Optical aberration — v · d · e Optical aberration …
3degree of curve — a measure of the sharpness of curvature, for United States railroads usually being the angle subtended at the center of curvature by a chord 100 ft. long and for highways by an arc 100 ft. long * * * Railroads. See under curve (def. 5) …
4photography, technology of — Introduction equipment, techniques, and processes used in the production of photographs. The most widely used photographic process is the black and white negative–positive system (Figure 1 >). In the camera the lens projects an image of… …
5Japanese sword — Traditional Samurai swords and fittings A Japanese sword, or nihontō (日本刀 or にほんとう, lit. Japanese sword …
6Straight razor — A straight razor with square point and a double transverse stabiliser Main article: Razor A straight razor is a razor with a blade that can fold into its handle.[1] …
7Katana — For other uses, see Katana (disambiguation). The katana (刀?) is one of the traditional Japanese swords (日本刀, nihonto …
8Headlamp — Headlight redirects here. For other uses, see Headlight (disambiguation). High Beams redirects here. For the urban legend also known by that name, see Killer in the backseat. A motor scooter s front with an impractical number and variety of… …
9Reflecting telescope — 24 inch convertible Newtonian/Cassegrain reflecting telescope on display at the Franklin Institute. A reflecting telescope (also called a reflector) is an optical telescope which uses a single or combination of curved mirrors that reflect light… …
10contact lens — one of a pair of small plastic disks that are held in place over the cornea by surface tension and correct vision defects inconspicuously. Cf. hard lens, intraocular lens, soft lens. [1885 90] * * * Thin artificial lens worn on the surface of the …
