Changes

==Origin==

==Origin==

Special use of [[Latin]] lēns a lentil (from its shape)

Special use of [[Latin]] lēns a lentil (from its shape)

*[http://en.wikipedia.org/wiki/17th_century 1693]

*[https://en.wikipedia.org/wiki/17th_century 1693]

==Definitions==

==Definitions==

*1. A piece of [[glass]], or other [[transparent]] substance, with two curved [[surfaces]], or one plane and one curved surface, serving to cause regular [[convergence]] or divergence of the [[rays]] of [[light]] passing through it.

*1. A piece of [[glass]], or other [[transparent]] substance, with two curved [[surfaces]], or one plane and one curved surface, serving to cause regular [[convergence]] or divergence of the [[rays]] of [[light]] passing through it.

*3. ''[[Geology]]'' . a body of [[rock]] or ore that is thick in the middle and thinner toward the edges, similar in shape to a biconvex lens.  

*3. ''[[Geology]]'' . a body of [[rock]] or ore that is thick in the middle and thinner toward the edges, similar in shape to a biconvex lens.  

==Description==

==Description==

A '''lens''' is an [[optical]] device with [[perfect]] or approximate axial [[symmetry]] which [[transmits]] and [[refracts]] [[light]], converging or diverging the beam. A simple lens consists of a single optical element. A compound lens is an array of simple lenses (elements) with a common axis; the use of multiple [[elements]] allows more optical aberrations to be corrected than is possible with a single element. Lenses are typically made of [[glass]] or [[transparent]] plastic. Elements which refract [[electromagnetic]] [[radiation]] outside the visual [[spectrum]] are also called lenses: for instance, a [http://en.wikipedia.org/wiki/Microwave microwave] lens can be made from [http://en.wikipedia.org/wiki/Paraffin_wax paraffin wax].[http://en.wikipedia.org/wiki/Lens_%28optics%29]

A '''lens''' is an [[optical]] device with [[perfect]] or approximate axial [[symmetry]] which [[transmits]] and [[refracts]] [[light]], converging or diverging the beam. A simple lens consists of a single optical element. A compound lens is an array of simple lenses (elements) with a common axis; the use of multiple [[elements]] allows more optical aberrations to be corrected than is possible with a single element. Lenses are typically made of [[glass]] or [[transparent]] plastic. Elements which refract [[electromagnetic]] [[radiation]] outside the visual [[spectrum]] are also called lenses: for instance, a [https://en.wikipedia.org/wiki/Microwave microwave] lens can be made from [https://en.wikipedia.org/wiki/Paraffin_wax paraffin wax].[https://en.wikipedia.org/wiki/Lens_%28optics%29]

[[Category: Physics]]

[[Category: Physics]]