Fres·nel lens
| \ ˈfrez-nəl-
, frā-ˈnel-
\
, 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
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“Fresnel lens.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Fresnel%20lens. Accessed 14 Apr. 2021.
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Time Traveler for Fresnel lens
The first known use of Fresnel lens was in 1865
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