Quote:
Originally Posted by adman
Yes, I think the degree to which a medium slows light depends on the wavelength of the light, and maybe the refractive index of the medium?? Someone correct me if I am wrong..... 
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It's wavelength independent (a photon of red light travels at exactly the same speed as a photon of blue light). But you are correct in the refractive index (density) of the medium the light passes through. The denser the material, the slower it moves.