SINCE 1828
Fresnel lens
noun
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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