focal distance (
41focal length — /ˈfoʊkəl lɛŋθ / (say fohkuhl length) noun 1. (of a mirror or lens) the distance from the optical centre to the focal point. 2. (of a telescope) the distance between the object lens and its corresponding focal plane …
42focal length — UK / US noun [countable] Word forms focal length : singular focal length plural focal lengths physics the distance from the centre of a lens or mirror to its focal point …
43Focal Length — WikiV The distance from the focal point to the principal point of the lens. The focal length is usually measured in millimeters of the lens. Focal length is an indication of the lens capability to capture a wide angle of view or a narrow view of… …
44focal 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 …
45focal length — (f) The distance from the lens to the principal focus is a primary descriptive parameter for the lens, when considering a thin simple lens. Focal length determines image size at a given lens to subject distance …
46focal interval — the distance from the anterior to the posterior focal point; called also Sturm i …
47focal 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 …
48focal length — noun (C) technical the distance between the centre of a lens and the focal point …
49focal 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 …
50focal length — noun the distance between the centre of a lens or curved mirror and its focus. ↘the equivalent distance in a compound lens or telescope …
