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Fresnel lens

noun
1.
Optics. a large lens with a surface of concentric grooves of prismatic profile, used in automobile headlights, searchlights, spotlights, etc.
Origin
1840-1850
1840-50; see fresnel
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for fresnel-lens

Fresnel lens

noun
1.
a lens consisting of a number of smaller lenses arranged to give a flat surface of short focal length
Word Origin
C20: named after Augustin Jean Fresnel (1788–1827), French physicist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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fresnel-lens in Science
Fresnel lens
  (frə-něl')   
A thin optical lens consisting of concentric rings of segmental lenses and having a short focal length. Placing a light source at the focal point of the lens gives rise to a strong beam of nearly parallel rays. Fresnel lenses are used primarily in spotlights, lighthouses, and the headlights of motor vehicles.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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