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crown lens

noun, Optics.
1.
a lens made of crown glass, usually used as the converging lens component of an achromatic lens.
Origin
1825-1835
1825-35
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for crown-lens

crown lens

noun
1.
a lens made of optical crown, esp the optical-crown part of a compound achromatic lens
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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10
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