| 单词 | fresnel lens |
| 释义 | Fresnel lensnounOptics. a large lens with a surface of concentric grooves of prismatic profile, used in automobile headlights, searchlights, spotlights, etc. Origin of Fresnel lensFirst recorded in 1840–50; see origin at fresnel Words nearby Fresnel lensfreshwater, freshwater drum, freshwater pearl, fresnel, Fresnel biprism, Fresnel lens, Fresnel mirrors, Fresno, fress, fret, fretboard Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for Fresnel lensFresnel lens nouna lens consisting of a number of smaller lenses arranged to give a flat surface of short focal length Word Origin for Fresnel lensC20: 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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Scientific definitions for Fresnel lensFresnel lens [ frə-nĕl′ ] 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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