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Very nice explanation. It gives me a new angle to consider. A questions
follow.
In good glass, virtually all of the re-radiators have resonances *above*
optical frequencies. Optical light hits them below their resonant
frequencies. Ultraviolet light does hit them on resonance, and is so
strongly absorbed that glass is opaque at such frequencies.
So why is it that Ultraviolet light is not re-radiated in large amounts?