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Fresnel mirrors

American  

plural noun

Optics.

  1. two plane mirrors joined together in a way that makes them useful for studying interference patterns.

Etymology

Origin of Fresnel mirrors

First recorded in 1965–70; fresnel

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.