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 is a lens consisting of a ...
http://en.wikipedia.org/wiki/Lens_%28optics%29

Lens can refer to: In optics. Lens (optics), an optical element with perfect or approximate axial symmetry which transmits and refracts light Lens (anatomy), a part of the eye ...
http://en.wikipedia.org/wiki/Lens

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noun . 1. a piece of transparent substance, usually glass, having two opposite surfaces either both curved or one curved and one plane, used in an optical device in changing the ...
http://dictionary.reference.com/search?q=lens

21. 6. 2002 WOW SoLetsGo, and do not be angry if some of the older webrojects links will not work. I just did not collect them all till now :)....f.
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