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As @PeterDonis mentioned also the coordinate two way speed of light can vary in non-inertial charts. Although that does also depend on...
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No, he doesn't. For example, if you transform to Rindler coordinates, the round trip speed of light is not always ##c## in those...
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For that, you'd have to do the experiment.
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Yes. Whatever diffraction pattern you manage to produce with your source (and you can design a source to produce any pattern you want -...