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I'm entering this conversation late... so perhaps this has already been**********************************************************************
mentioned and I missed it. Have you looked at Feynman's approach to the
index of refraction? It seems to me that the 'absorption and reemmsion
etc' are really just a smokescreen for the scatterning process. An
incoming wave induces a time dependent polarization of the atomic charge
distribution that can then produce it's own radiation... out of phase
with the original wave of course... I think it's the influence of this
additional wave that produces the change in speed of the origianal
wave... at least that's my understanding.