A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction.
A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually aligned along a common axis. Lenses can also focus waves other than visible light, such as microwave lenses, electron lenses, acoustic lenses, or explosive lenses.
Relevant tags: opticsgeometric-opticsvisible-light
