Wiccan_Child
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- Mar 21, 2005
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The atoms that make up the glass absorb and reemit the photon, with a slight delay between. This delay manifests as a 'slowing down' of the photon - the photon isn't slowed, it's just taking a pit-stop at any atom that absorbs it.Classical explanation would be OK, if you gave the answer of the question "what defines epsilon and mu for glass". Thus I'm going to ask what kind of interaction is taking place. Or IOW, what slows down a particular photon. Is, what exits the glass, the same photon that entered the glass or another photon? If it is not, then what absorbed it and reemitted it? And what remembered the photons original quantum state and reemitted it in the same quantum state? Also, if the photon is absorbed how it happens that the reemitted photon is still entangled with another photon? I think they measured entangled photons while forcing them to travel long fiber-optical channel.
The photon is reemitted at the same energy as before because the inert atom is excited by that exact amount of energy, so to go back to its boring ground state it needs to reemit that same amount of energy. The 'information' is stored in the excited photons.
This isn't always the case, however. Photons can be emitted at lower or even higher wavelengths than when they were absorbed; this is known as fluorescence, and is why UV light can make something glow in the visible range.
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