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How wave vector direction is opposite to energy flow in meta-material?
I can see mathematically the in negative refractive index meta-material the direction of wave vector is opposite to the energy flow. Mathematically it is fine but I want to have physical meaning? For ...
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How is light slowing down in a medium thought of in the photon picture? [duplicate]
The speed of light in any medium besides vacuum is smaller than $c$. In a classical way, I just look at that as a wave that propagates less fast, the change in EM-field is passed on slower. How should ...
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