focal axis
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focal plane — n a plane that is perpendicular to the axis of a lens or mirror and passes through the focus … Medical dictionary
Focal mechanism — The focal mechanism of an earthquake describes the inelastic deformation in the source region that generates the seismic waves. In the case of a fault related event it refers to the orientation of the fault plane that slipped and the slip vector… … Wikipedia
Focal 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 … Wikipedia
focal point — 1. Also called principal focus. Optics. either of two points on the axis of a mirror, lens, or other optical system, one point being such that rays diverging from it are deviated parallel to the axis upon refraction or reflection by the system… … Universalium
focal — adj. of, at, or in terms of a focus. Phrases and idioms: focal distance (or length) the distance between the centre of a mirror or lens and its focus. focal plane the plane through the focus perpendicular to the axis of a mirror or lens. focal… … Useful english dictionary
focal plane — In photography, an image line at right angle to the optical axis passing through the focal point. This forms the plane of sharp focus when a camera is set on infinity. Also see aperture, camera, focal length, and f/stop … Glossary of Art Terms
focal adhesions — Areas of close apposition, and thus presumably anchorage points, of the plasma membrane of a fibroblast (for example) to the substratum over which it is moving. Usually 1 x 0.2 m m with the long axis parallel to the direction of movement; always… … Dictionary of molecular biology
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 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 plane — fo′cal plane n. opt a plane through a focal point and perpendicular to the axis of a lens, mirror, or other optical system • Etymology: 1890–95 … From formal English to slang
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 …
