A piece of glass or other transparent substance with curved sides for concentrating or dispersing light rays, used singly (as in a magnifying glass) or with other lenses (as in a telescope)
The light-gathering device of a camera, typically containing a group of compound lenses
An object or device that focuses or otherwise modifies the direction of movement of light, sound, electrons, etc
LENS, a piece of transparent material used in changing the convergence of light rays [n] / LENSE, lens (a piece of transparent material used in changing the convergence of light rays) [n] / LENS, to make a film of [v]