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crown lens

 - 2 dictionary results

crown lens

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

Origin:
1825–35
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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crown lens  
n.  The crown-glass element in an achromatic lens.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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