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Originally Posted by Tophat665
The speed of light is constant regardless of the frame of reference, so, If there were a concave mirror - a bowl with a perfectly reflective inside surface - travelling through space at the speed of light with respect to the observer, and light were to hit that bowl, would it remain in the bowl? Would it pool in there? How would it appear to the observer?
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If a photon were to strike the surface, it would reflect back at the speed of light as if it had reflected from a fixed point, but with reduced momentum because a photon will always travel at the speed of light in any medium. You'll have to read up on how a photon can be massless and still have momentum because I haven't taken physics in years.