Fresnel lens Hear it!

Fresnel lens definition

Fresnel lens

a thin optical lens of many concentric rings, having the properties of a much thicker and heavier lens: used in cameras, lighthouse beacons, etc.

Etymology: after Augustin Jean Fresnel

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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