Fresnel lens

noun
Fres·​nel lens | \ˈfrez-nəl-, frā-ˈnel- \

Definition of Fresnel lens 

: a lens that has a surface consisting of a concentric series of simple lens sections so that a thin lens with a short focal length and large diameter is possible and that is used especially for spotlights

First Known Use of Fresnel lens

1865, in the meaning defined above

History and Etymology for Fresnel lens

Augustin J. Fresnel

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The first known use of Fresnel lens was in 1865

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