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From Nordan Symposia
Jump to navigationJump to searchCreated page with 'File:lighterstill.jpgright|frame ==Origin== Special use of Latin lēns a lentil (from its shape) *[http://en.wikipedia.org/wiki/17th_cen...'
[[File:lighterstill.jpg]][[File:Lens_and_wavefronts.gif|right|frame]]
==Origin==
Special use of [[Latin]] lēns a lentil (from its shape)
*[http://en.wikipedia.org/wiki/17th_century 1693]
==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.
*2. some [[analogous]] device, as for affecting [[sound]] [[waves]], [[electromagnetic]] [[radiation]], or [[streams]] of [[electrons]].
*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==
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]
[[Category: Physics]]
==Origin==
Special use of [[Latin]] lēns a lentil (from its shape)
*[http://en.wikipedia.org/wiki/17th_century 1693]
==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.
*2. some [[analogous]] device, as for affecting [[sound]] [[waves]], [[electromagnetic]] [[radiation]], or [[streams]] of [[electrons]].
*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==
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]
[[Category: Physics]]
