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In response the this question, daryl@darylscience.com gave an
explanation based upon the light being continuously absorbed and
reemitted. I've seen this explanation in several physical science
textbooks aimed at both the high school level and also the conceptual
physics level in college.
I don't like this explanation very well. Do the rest of you accept
this?
This explanation seems to promote the idea that the
interaction between the E&M radiation and the atoms in the medium
involve complete absorption that excites an electron to a higher
quantum state, then reemission.
This is the description we use for
spectroscopic line absorption and line emission.