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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.
A concave lens is thinner at the centre than at the edges. Concave lenses are thinner at the middle. Rays of light that pass through the lens are spread out (they diverge). A concave lens is a diverging lens. When parallel rays of light pass through a concave lens the refracted rays diverge so that they appear to come from one point called the principal focus. The distance between the principal focus and the centre of the lens is called the focal length.