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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.


Fresnel lens

noun

  1. a lens consisting of a number of smaller lenses arranged to give a flat surface of short focal length
“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

Fresnel lens

/ frə-nĕl /

  1. 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.
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Word History and Origins

Origin of Fresnel lens1

First recorded in 1840–50; fresnel
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Word History and Origins

Origin of Fresnel lens1

C20: named after Augustin Jean Fresnel (1788–1827), French physicist
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Example Sentences

This is called a 'Fresnel lens' or 'zone plate lens', and it focuses light using diffraction rather than refraction.

Before the 11 a.m. boat ride back to the mainland, Dre Elmore likes to show off the retired Fresnel lens and the array of still-working machinery in the fog signal building.

Notable for the eponymous 1898 lighthouse — the tallest in Washington state — visitors can climb the 135 steps to the lantern room, where the original Fresnel lens still signals the Gray’s Harbor entrance.

The next morning, I went to the visitor station, in the recently refurbished fog signal building, to see the lighthouse’s original, first-order — as the biggest versions are called — Fresnel lens on display.

Plenty of interactive exhibits brings the voyage to life, including hands-on experimentation with a chronometer and Fresnel lens, outtakes from the duo’s journal, and short films.

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Fresnel biprismFresnel mirrors