crown lens

The crown-glass element in an achromatic lens.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

crown lens

(General Physics) a lens made of optical crown, esp the optical-crown part of a compound achromatic lens

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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Noun

crown lens - a lens made of optical crown glass

lens, lens system, lense - a transparent optical device used to converge or diverge transmitted light and to form images

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References in periodicals archive

The B11 candles feature an innovative crown lens that creates a unique sparkling effect, making them ideal for use in chandelier, sconce and uplighting applications.

GREEN CREATIVE Launches ENERGY STAR Certified 60W Incandescent Replacement LED Candles

MAGEE ALL-SPHERICAL NEWTONIAN REFLECTOR (All dimensions are in inches) Component Diam- Radius of Following eter curvature thickness Primary mirror 6.0 -72.00 ([R.sub.1]) 30.42 Flint lens 1.0 7.11 ([R.sub.2]) 0.10 (SF-12 glass) 4.05 ([R.sub.3]) 0.00 Crown lens 1.0 4.05 ([R.sub.4]) 0.10 (BK-7 glass) flat ([R.sub.5]) 0.00 Prism 1.0 flat ([R.sub.6]) 1.00 (BK-7 glass) flat ([R.sub.7]) 7.54 Equivalent focal length: 53.7 inches Radii of curvature are positive if convex to the sky, negative if concave.

A short Newtonian with a spherical mirror

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