CD's as parabolic mirrors?

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From: John Tinker <jtinker_at_coin.org>
Date: Fri Dec 8 09:29:14 2000

I just noticed that sunlight reflecting off the top side of a CD focuses
somewhat, maybe with a focal length of about 20 feet. Off of the data side, it
spreads. I've tried it with several different types, and so far they all show
the same effect. Would anyone care to explain why?
Received on Fri Dec 08 2000 - 09:29:14 GMT

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