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For questions related to observers in relativity or quantum mechanics.

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Why should the speed of light necessarily be the same for all observers in train thought exp...

It seems to me even if the speed of light is not the same for all observers, that it behaves like low speeds if lights strike when train is nearer to point B than it is to point A, from point B to the … But if the lights strike when train is nearer to point A than it is to point B, then the speed of light should be the same for all observers in order to get the same result. …
Parviz Pirizade's user avatar