Focal-plane
noun, Optics.
1.
a plane through a focal point and normal to the axis of a lens, mirror, or other optical system.
Compare .
2.
the transverse plane in a telescope where the real image of a distant view is in focus.
noun
1.
the plane that is perpendicular to the axis of a lens or mirror and passes through the focal point
2.
the plane in a telescope, camera, or other optical instrument in which a real image is in focus
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noun 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 and the other point being such that rays parallel to the […]
- Focal-ratio
noun, Optics, Photography. 1. . noun 1. (photog) another name for f-number
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noun, Pathology. 1. an epileptic manifestation arising from a localized anomaly in the brain, as a small tumor or scar, and usually involving a single motor or sensory mechanism but occasionally spreading to other areas and causing convulsions and loss of consciousness.