Monday, 6 May 2019

electromagnetic radiation - Where do the energy and momentum come from when light is perfectly reflected on a surface?


If you send a light beam to a surface which reflects the light perfectly I would say that on the surface is put a force of the light so the surface moves backwards. But where does that energy comes from? If it perfectly reflects the light than the frequency shouldn't be changed and the speed of light wouldn't change either. So were does the moving surface gets his energy from? Or isn't it possible to maintain their frequency or perhaps the surface is not moving at all?





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