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crown lens

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noun Optics.
  1. a lens made of crown glass, usually used as the converging lens component of an achromatic lens.
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Origin of crown lens

First recorded in 1825–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
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
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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