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Interesting discussion on Fresnel Lenses! If anyone is interested, I have a photo of a Fresnel Lens from a lighthouse on our homepage. I took the photo last summer at a museum in Duluth. The photo can be found at an "Interesting Physics Photos" selection near the bottom of the homepage ->
www.engineering.sdstate.edu/~physics/physics.htm
Let me know if you have trouble getting it.
Oren Quist, SDSU