Concave and Convex lens
Human eye balls
http://www.wikihow.com/Clean-a-PlayStation-2-Lens
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Two basic kinds of lenses are converging lenses, which focus light rays to a point, and diverging lenses, which spread out light rays. Converging lenses are thick in the center and thin at the edges, while diverging lenses are thin in the center and thick at the edges.
You cannot clean your PlayStation 2 lens without opening it. You will have to turn the machine off, unplug all of the plugs and open it to get to the lens.
2
The power of a lens is calculated as the reciprocal of its focal length in meters. Therefore, a 2 m focal length lens would have a power of 0.5 diopters.
Independent Lens - 1999 No Hair Day 2-2 was released on: USA: 9 October 2000
Lens on Talent - 2009 Race Relations 2-2 was released on: USA: 26 September 2010
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Because the 2cm lens has 4 times the area of a 1cm lens. (area = Pi*r2)
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