principal focal plane

См. также в других словарях:

• focal plane — Optics. 1. a plane through a focal point and normal to the axis of a lens, mirror, or other optical system. Cf. principal plane. 2. the transverse plane in a telescope where the real image of a distant view is in focus. [1890 95] * * * …   Universalium

• focal plane — /ˈfoʊkəl pleɪn/ (say fohkuhl playn) noun 1. the plane normal to the principal axis of a lens (or system of lenses) or a mirror, which passes through the focal point. 2. the plane in which light rays from an external object are focused in a camera …  

• Focal Plane — WikiV A plane (through the focal point) at right angles to the principal point of the lens …   Audio and video glossary

• focal plane — noun : a plane that is parallel to the plane of a lens or mirror and that passes through a principal focus …   Useful english dictionary

• Focal length — The focal length of an optical system is a measure of how strongly it converges (focuses) or diverges (diffuses) light. A system with a shorter focal length has greater optical power than one with a long focal length. Thin lens approximation For… …   Wikipedia

• focal length — Optics. 1. the distance from a focal point of a lens or mirror to the corresponding principal plane. Symbol: f 2. the distance between an object lens and its corresponding focal plane in a telescope. Also called focal distance. [1745 55] * * * …   Universalium

• focal — focal, ale, aux [ fɔkal, o ] adj. et n. f. • 1812; du lat. focus « foyer » 1 ♦ Phys. Qui concerne le foyer, les foyers d un instrument d optique. ⇒ bifocal. Axe focal, plan focal. N. f. Distance focale. Objectif à focale variable. ⇒ zoom. 2 ♦… …   Encyclopédie Universelle

• principal plane — noun : any of the planes perpendicular to the axis and passing through the principal points of an optical system * * * Optics. a plane that is perpendicular to the axis of a lens, mirror, or other optical system and at which rays diverging from a …   Useful english dictionary

• principal plane — Optics. a plane that is perpendicular to the axis of a lens, mirror, or other optical system and at which rays diverging from a focal point are deviated parallel to the axis or at which rays parallel to the axis are deviated to converge to a… …   Universalium

• focal length — noun The distance at which something (e.g. a lens, mirror etc.) is in focus; in air it is the distance along the optical axis from a principal plane of the lens to one of the lenss focal points …   Wiktionary

• focal length — fo′cal length n. opt the distance from a focal point of a lens or mirror to the corresponding principal plane Also called fo′cal dis tance …   From formal English to slang