Fresnel lens

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

Definition of Fresnel lens

  1. :  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

Origin and Etymology of fresnel lens

Augustin J. Fresnel

First Known Use: 1865

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a trip made at another's expense

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