fresnel lens

Definitions

General Science

  • noun
    (written as Fresnel lens)
    a thin lens made up of concentric rings, each having a curvature corresponding to a similar ring of a plain convex lens

Electronics

  • (written as Fresnel lens)
    A thin lens with stepped concentric rings enabling it to have the optical properties of lenses which are much thicker and heavier. Used, for instance, in overhead projectors and lighthouses.

Media Studies

  • noun an adjustable lens for a light source that allows the beam to be changed easily from spot to flood
http://www.dictionarycentral.com/definition/fresnel-lens.html