plano-convex

[pley-noh-kon-veks, -kon-veks, -kuhn-]

pla·no-con·vex

[pley-noh-kon-veks, -kon-veks, -kuhn-]
adjective Optics.
pertaining to or noting a lens that is plane on one side and convex on the other.


Origin:
1655–65; plano-1 + convex
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Plano-convex is always a great word to know.
So is gobo. Does it mean:
the offspring of a zebra and a donkey.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Collins
World English Dictionary
plano-convex (ˌpleɪnəʊˈkɒnvɛks)
 
adj
(of a lens) having one side convex and the other side plane

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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