Quote:
Originally Posted by aapezzuto
Thats actually very interesting, if this has a special name that would be very helpful, like the flat lenses that have the etched rings are called something (I think bernell lenses)
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They're called Fresnel Lenses and that might be a pretty good place to start investigating...
How does a Fresnel lens work?
http://www.howstuffworks.com/question244.htm