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For other uses, see Lens.

A lens is a transmissive optical device which affects the focusing of a light beam through refraction. A simple lens consists of a single piece of material, while a compound lens consists of several simple lenses (elements), usually along a common axis. Lenses are made from transparent materials such as glass, ground and polished to a desired shape. A lens can be used to focus light to form an image, unlike a prism which refracts light without focusing. Devices which similarly refract radiation other than visible light are also called lenses, such as microwave lenses or acoustic lenses.

The variant spelling lense is sometimes seen. While it is listed as an alternative spelling in some dictionaries, most mainstream dictionaries do not list it as acceptable.


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