If you read the What's Going On section of the Parabolas snack, it
explains this phenomenon and shows a cross section of what happens.
3601 Lyon Street
San Francisco, CA 94123-1099
On Sun, 8 Jun 2003, Joseph Casioppo wrote:
> How does the real image of the coin (or pushbutton) get projected into
> space? Doesn't the image require a screen of some sort for the rays to
> focus on to?
> Joe C
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