By reflection of photons from a mirror, the mirror must get an impulse of 2p=h/pi.l for every photon. This means that the mirror receives kinetic energy. But the photon has the energy it has before the refection. How does QED explain this? In "Photons and perfect mirror" the question is answered as a consequence of other explanation but I does not see the mechanism which leads to it. I try to clarify this as respond to the answers.
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