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quote:Originally posted by Solvay_1927True, Turbo, true - but the question is, what causes the light rays to refract (at the level of the fundamental particles within in the medium) and what happens to the speed of the light rays as they pass through the medium (and how does that fit with relativity theory)?Classical optics isn't sufficent to explain this (I think?), so you end up in the realm of quantum physics (which can explain it - but unfortunately it explains it in a language I don't understand!)
quote:When a photon interacts with a particle, is it the same photon that is re-emitted? If the original photon is absorbed & another emitted in its place, then c will not be violated.I suggest this as I believe photons can be emitted by certain particles being excited. I can't imagine those particles have lots of little photons inside them queueing up to be emitted, so how are they formed? & doesn't this infer that photons interacting with a particle are somehow absorbed and transformed to become a different kind of particle, or constituent parts of other particles?
quote:Re the absorbtion and emission of photons, when a photon is absorbed it is effectively destroyed and its energy used for someting else like incresing the angular momentum of the electron in its orbit around the nucleus (raising the energy level in the atom) when it iemitted the oscillating electromagnertic field associated with the electron moving to a different quantised orbit creats a new photon. The idea of having a whole load of photons sitting inside an electron is not a good one for visualising the process. it is better to think of an electron that is in a stable orbit is continually emitting and reabsorbing a photon that would cause its energy level to change
quote:Originally posted by DoctorBeaverSolvay - I was referring to Turbo's mentioning refraction as being the misunderstanding. I'm fully aware of what refraction is but I don't see that it bears any relevance to my initial point. As far as I'm aware, refraction changes the frequency but not the speed of photons
quote: Light propagates more slowly through denser media (higher refractive index) than through rarified media.
quote:won't the combined speed of these colliding particles be faster than the speed of light ?...I figure you'll probably say No eh ?