Refractive index depends on...

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sophiecentaur is offline
Nov20-13, 05:54 AM
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Quote Quote by DrDu View Post
I also don't quite understand this discussion on the distinction between "true" speed of light and it's apparent value in a medium.
E.g. when you observe a supernova, are detected hours after the neutrinos due to their interaction with the interstelar medium. I think it would be strange not to say that they have a lower speed.
I thought that the OP was just about the wavelength at which the refractive index is quoted. That velocity ratio is defined in terms of phase velocity and an endless wave train, afaik, which is what the simple Snell's Law diagram is based on. There seems to have been a bit of 'inflation' in the thread which risks confusing the guy with the simple question.

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