Fresnel-lens meaning

frə-nĕl
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.
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A thin optical lens of many concentric rings, having the properties of a much thicker and heavier lens: used in cameras, lighthouse beacons, etc.
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A thin optical lens consisting of concentric rings of segmental lenses and having a short focal length. Placing a light source at the focal point of the lens gives rise to a strong beam of nearly parallel rays. Fresnel lenses are used primarily in spotlights, lighthouses, and the headlights of motor vehicles.
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The hollow cylindrical lens used in the Fresnel lamp.
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Origin of fresnel-lens

  • After Augustin Jean Fresnel

    From American Heritage Dictionary of the English Language, 5th Edition