diverging lenses

diverging lens

noun Optics.
a lens that causes a beam of parallel rays to diverge after refraction, as from a virtual image; a lens that has a negative focal length.
Also called negative lens.
Compare converging lens.
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WordNet
diverging lens

noun
a lens such that a parallel beam of light passing through it is caused to diverge or spread out 
WordNet® 3.0, © 2006 by Princeton University.
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