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Lens
[[File:BiconvexLens.jpg|thumbnail|200px|Lens]] 
A '''lens''' is a piece of [[glass]] or clear (transparent) [[plastic]] that changes the way things look. They may appear larger, smaller, or inverted. Some places lenses are used include spectacles (glasses), contact lenses, cameras, projectors, microscopes, telescopes, magnifying glasses, etc. Eyes are also considered lenses. 

They work by refraction, or the bending of light.

Lenses found in glasses, have three main shapes. Each different shape, manipulates the image slightly (making it bigger or smaller). The three types are as follows:
Convex: bulges outwards from the lens.
Concave: depressed into the lens.
Planar: flat

== History ==
First references about lenses were in the ancient Greek piece of Aristofan "Clouds", where with lenses and sun's light made a fire.

== Other pages ==
* [[Convex lens]]
* [[Concave lens]]
* [[Camera lens]]
* [[Focal length]]


{{tech-stub}}

[[Category:Optics]]

[[ar:عدسة (بصريات)]]
[[az:Linza]]
[[bn:লেন্স]]
[[be:Лінза]]
[[be-x-old:Лінза]]
[[bg:Леща (оптика)]]
[[bs:Leće (optika)]]
[[ca:Lent]]
[[cs:Čočka (optika)]]
[[da:Optisk linse]]
[[de:Linse (Optik)]]
[[dsb:Linsa (optika)]]
[[et:Lääts]]
[[el:Φακός]]
[[en:Lens (optics)]]
[[es:Lente]]
[[eo:Lenso (optiko)]]
[[eu:Leiar]]
[[fa:عدسی]]
[[fr:Lentille optique]]
[[fy:Lins (optyk)]]⏎
[[gan:透鏡]]
[[ko:렌즈]]
[[hi:लेंस]]
[[hsb:Čóčka (optika)]]
[[hr:Leća (optika)]]
[[io:Lenso]]
[[id:Lensa]]
[[is:Linsa]]
[[it:Lente]]
[[he:עדשה]]
[[jv:Lènsa]]
[[kk:Оптикалық линза]]
[[ht:Lantiy]]
[[lv:Lēca]]
[[lt:Lęšis (optika)]]
[[hu:Optikai lencse]]
[[mk:Леќа (оптика)]]
[[ml:ലെൻസ്]]
[[ms:Kanta]]
[[nah:Ixtehuilotl]]
[[nl:Lens (optica)]]
[[ja:レンズ]]
[[no:Optisk linse]]
[[nn:Optisk linse]]
[[pl:Soczewka]]
[[pt:Lente]]
[[ro:Lentilă]]
[[qu:Linti]]
[[ru:Линза]]
[[si:කාච (ප්‍රකාශ)]]
[[sk:Šošovka (optika)]]
[[sl:Leča (optika)]]
[[sr:Сочиво (оптика)]]
[[sh:Leća]]
[[fi:Linssi (optiikka)]]
[[sv:Lins]]
[[ta:வில்லை]]
[[te:కటకము (వస్తువు)]]
[[th:เลนส์เว้า]]
[[tr:Mercek]]
[[uk:Лінза]]
[[ur:عدسہ (بصریات)]]
[[vi:Thấu kính]]
[[zh:透镜]]