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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.

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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Word History and Origins

Origin of crown lens1

First recorded in 1825–35

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crown landcrown octavo

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