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As I wrote several days ago, I am no longer satisfied with the "absorbed,
reemitted, absorbed again" explanations. Any comments on what is below?
I would suggest that it is important to stress that electromagnetic
radiation always propogates at the same speed (speed of light) but that
when light enters a transparent medium it is absorbed, reemitted,
abosorbed again, reemitted again etc. and that this process makes
it _seem_ that the light has moved slower in 'passing through' the glass.