A lens is a transmissive optical device that focuses or disperses a insubstantial beam by means of refraction. A simple lens consists of a original piece of transparent bodily , while a fuse lens consists of quite a lot of simple lenses elements Oppose be on the side of, usually arranged along a common axis.
Lenses are made from materials such as glass or ductile , and are argument and polished or moulded to a desired form. A lens can convergence light to form an image , unlike a prism , which refracts light without focusing. Devices that similarly focus before disperse radiation other than visible light are again called lenses, such since microwave lenses, electron lenses or acoustic lenses. The word lens comes as of the Latin name of the lentil , whereas a double-convex lens is lentil-shaped.
The genus of the lentil plant is Lens , and the most commonly eaten kind is Lens culinaris. The lentil plant also gives its name to a geometric figure. The modification spelling lense is on seen. While it is listed as an additional spelling in some dictionaries, most mainstream dictionaries make sure of not list it while acceptable. The oldest lens artifact is the Nimrud lens , dating in return years 7th century B. The earliest written records of lenses date in the direction of Ancient Greece , among Aristophanes ' play The Clouds BC mentioning a burning-glass a biconvex lens used to focus the sun 's rays on the way to produce fire.
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