Fres·nel lens
(frə-nĕl)
(frə-nĕl)n.
A thin optical lens consisting of concentric rings of segmental lenses and having a short focal length, used primarily in lighthouses, spotlights, overhead projectors, and the headlights of motor vehicles.
[AfterAugustin Jean Fresnel.]
Fresnel lensPrisms that make up a
Fresnel lens bend and
magnify light rays, creating
a single, concentrated beam
of light.