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At 5:16 PM -0500 2/22/01, Jaranson, John (J.W.) wrote: > >UV light certainly gets through the glass, especially on cars as old as >ours. New car glass has some UV blocking built into it, but we still use I think that the truth lies somewhere in the middle -- that typical glass attenuates ultraviolet much more than visible, but that the attenuation is not infinite. What fraction of the ultraviolet makes it through typical glass at the thickness of a typical windshield? A percent? One part in a million? Also, "ultraviolet" just means higher energy than visible; you can bet that the transmittivity of glass, as with anything else, will be a function of the frequency of the incident light. There is the tale of Feynman watching the Trinity explosion through the window of his truck... -Greg ------------------------------------------------------------------- Pitch in! Send your pledge of support! mailto:support@vwtype3.org