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Chi Meson
Oct26-03, 07:55 PM
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Originally posted by russ_watters

So to clarify: a photon always travels at C. Refraction is often oversimplified to imply that it doesn't. This is especilly true in high school physics classes.
That would be SOME high school physics classes! Many textbooks (Paul Hewitt's especially) try to make it clear that light waves/photons always travel at c (disregarding the latest theories of variances).

The net propagation of light is slowed by the photons interactions with the atoms and molecules of the substance it is passing through. But while the photon is travelling from atom to atom, it is propagating at c.