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Re: tanning beds

My brother was reading one of Feynman's popular books (the one with a
section entitled "Los Alamos from Below"). In one section, Feynman
mentioned that he was probably the only guy who saw the first Trinity test
with the human eye. Apparently, he saw it through glass and assumed that
only uv waves can hurt the eye. Can anyone provide more information
regarding this statement? Does glass really absorb all of the harmful
uv? Is it really true that visible light cannot damage the eye?
Unfortunately, I have never read the book myself.

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| Robert Cohen Department of Physics |
| East Stroudsburg University |
| bbq@esu.edu East Stroudsburg, PA 18301 |
| http://www.esu.edu/~bbq/ (570) 422-3428 |
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On Wed, 17 Nov 1999, fred brace wrote:

We were discussing the fact that uv waves are absorbed by glass and that
you can't get a sunburn through glass. A number of people mentioned tanning
beds. What is the type of glass used there that lets uv waves pass through.