n-th focal point
91Point Danger (Australia) — Infobox lighthouse|name=Point Danger location=Gold Coast, Australia caption= coordinates = yearlit= 1971 yeardeactivated= automated= 1971 intensity= elevation= 45 metres range= convert|18|nmi|km|0 foundation= construction= Concrete shape= Four… …
92Point Reyes Lighthouse — Infobox Lighthouse caption = Point Reyes Light location = Point Reyes, California coordinates = coord|37.9957|N|123.02327|W yearlit = 1870 automated = 1975 foundation = Concrete construction = Cast Iron with Brick Lining shape = 16 sided… …
93Point Clark, Ontario — This article is about the lakeside community in Ontario. For the city with a similar name in Alaska, see Clark s Point, Alaska Point Clark is a lakefront town on Lake Huron, in Canada. It is south of Kincardine and north of Goderich. Main streets …
94focal — adj. Focal is used with these nouns: ↑point …
95focal length — In photography, the distance between the lens (its rear nodal point) and the focal plane (the film s or paper s surface). Also see aperture, camera, f/stop, telephoto, and wide angle …
96Point Riche — The Headland of Point Riche is located near the community of Port aux Choix on the Northern Peninsula of the island of Newfoundland in the Canadian province of Newfoundland and Labrador. Point Riche to Cape Bonavista was the defining points of… …
97focal distance — (of the eye) the distance between the lens and the point behind the lens at which light from a distant object is focused. In a normally sighted person the point of focus is on the retina, but in myopia (short sightedness) the focus is in front of …
98focal distance — distance from the center of a lens to the point of focus …
99focal length — distance from the center of a lens to the point of focus …
100Cardinal point (optics) — For other uses, see Cardinal point (disambiguation). In Gaussian optics, the cardinal points consist of three pairs of points located on the optical axis of an ideal, rotationally symmetric, focal, optical system. For ideal systems, the basic… …
