converging lens

converging lens

 
noun Optics.
a lens that converts parallel rays of light to convergent rays and produces a real image.
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Also called positive lens.
Compare diverging lens.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Converging lens is always a great word to know.
So is doohickey. Does it mean:
the offspring of a zebra and a donkey.
a gadget; dingus; thingumbob.
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WordNet
converging lens

noun
lens such that a beam of light passing through it is brought to a point or focus 
WordNet® 3.0, © 2006 by Princeton University.
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