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The refractive index measures the phase velocity of light, which does not carry information
This can occur in plasmas. If this applied to the sun's corona and the actual rays of Hyades went through the sun's photosphere instead of the corona and then to earth then Hyades could have been shifted outward and visible for Eddington and had nothing to do with gravity?
Quote from: ron123456 on 29/08/2020 17:52:38This can occur in plasmas. If this applied to the sun's corona and the actual rays of Hyades went through the sun's photosphere instead of the corona and then to earth then Hyades could have been shifted outward and visible for Eddington and had nothing to do with gravity?Relativity predicts that the bending of the light rays is independent of frequency, whereas refraction for em radiation through the sun’s photosphere varies with frequency. This has been tested by observing different frequency quasars and is found to be independent of frequency. So, a gravity effect, not refraction.