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Take a look at the following site for some information
http://www.kodak.com/US/en/motion/dynamic/index.shtml
Dr. Lawrence D. Woolf; General Atomics, 3550 General Atomics Court, San
Diego, CA 92121; Ph: 858-455-447; www.sci-ed-ga.org
Subject: Re: Fresnel lens image
If you can actually grossly feel and see these parallel grooves, then it
cannot possibly be a diffraction effect -- for diffraction effects, you
need parallel grooves that are spaced at least of the order of 1000 per
inch, but the closer the better. What you have is more likely a refraction
effect -- probably a triangular shaped groove in the plastic that lets you
see one image when viewing through one face (side of the goove) and another
image when looking through the other. I imagine the pictures underneath
must be sliced at the same spacing as the grooves and overlapped by
alternating the slices? Just my guess. Wolfgang