Relativity and Cosmology


Reflection of Light From Moving Mirror

Authors: Eric Su

The application of reflection symmetry to two inertial reference frames shows that the elapsed time is conserved in all inertial reference frames. The conservation of the elapsed time indicates that the reflection of light between a pair of stationary mirrors should take the same elapsed time in all inertial reference frames. In one reference frame, both mirrors are stationary. In other reference frames, both mirrors are moving. The distance traveled by the light between the moving mirrors depends on the direction. The conservation law shows that the light travels at a different speed upon reflection by a moving mirror.

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[v1] 2019-01-11 18:08:02

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