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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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Time Traveler for Fresnel lens
The first known use of Fresnel lens was in 1865
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