Fresnel lens Meaning, Definition & Usage

  1. noun lens composed of a number of small lenses arranged to make a lightweight lens of large diameter and short focal length

WordNet


Definitions
  1. (Opt.), a compound lens formed by placing around a central convex lens rings of glass so curved as to have the same focus; used, especially in lighthouses, for concentrating light in a particular direction; so called from the inventor.

Webster 1913