Is refraction of light a thermodynamic process?
Can it be explained by conservation of energy?
If so, does temperature has an effect on refraction of light?
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Refraction of Light is not a Thermodynamic process. If you study the QED basis of refraction, you notice that the difference happens in time. The speed of light is constant, and a photon which is refracted, doesn't actually travel any slower, it just travels a longer path, and needs thus more time. If it hit's somewhere, then it's not refracted. It's gone, and this increases heat. But that was not the photon which got refracted. And this heat might cause a thermal expansion on the material, which means the refracting properties of the material are changing. Still, this change is NOT caused by the refracted photons. It's caused by the absorbed photons.