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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.
Concave Function. In mathematics, concave function and convex function play an important role. Both the functions are related to each other. A concave function is the negative of a convex function.A function $f(x)$ is concave over a convex set if the function: $f(x)$ is a convex function over the set.oncave Function. In mathematics, concave function and convex function play an important role. Both the functions are related to each other. A concave function is the negative of a convex function.