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concave lens

n. a lens such that a parallel beam of light passing through it is caused to diverge or spread out [syn: diverging lens]

Usage examples of "concave lens".

He flipped up a round concave lens near the head of his walking-stick and invited me to examine my manuscript through it.

If it passes through a convexo-concave lens, it can even be narrowed!

From Darlow, it looked more like a concave lens than a convex one.

He could use a concave lens of air, held in shape by a film of his own flesh, which was far more transparent than an optical system composed entirely of the latter substance.