Fresnel lens
noun
Fres·nel lens
ˈfrez-nəl- 
frā-ˈnel-
frā-ˈnel-
: 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 22 Dec. 2024.
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