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â¢ CONCAVE LENS (noun) The noun CONCAVE LENS has 1 sense: 1. a lens such that a parallel beam of light passing through it is caused to diverge or spread out. Familiarity information: CONCAVE LENS used as a noun is very rare.
For a spherically curved mirror in air, the magnitude of the focal length is equal to the radius of curvature of the mirror divided by two. The focal length is positive for a concave mirror, and negative for a convex mirror.In the sign convention used in optical design, a concave mirror has negative radius of curvature, so.he focal length of a lens determines the magnification at which it images distant objects. It is equal to the distance between the image plane and a pinhole that images distant objects the same size as the lens in question.