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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.
CONVEX or POSITIVE lenses will CONVERGE or FOCUS light and can form an IMAGE. CONCAVE or NEGATIVE lenses will DIVERGE (spread out) light rays. You can have mixed lens shapes too: See a demonstration (opens a new window) of what happens to the light path when you combine several convex or concave lenses. Perfectly straight, until something bends it. The straight paths of light are called LIGHT RAYS.