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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.
The distance from the lens to the spot is the focal length of the lens, which is commonly abbreviated f in diagrams and equations. If the lens is biconcave or plano-concave, a collimated beam of light passing through the lens is diverged (spread); the lens is thus called a negative or diverging lens.