My mind keeps boggling around this question is speed of light really a constant or not?

My mind keeps boggling around this question is speed of light really a constant or not?

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TopNewesti've read many books on relativity but i didin't find any satisfactory answers, here "satisfactory" means mathematical proof!i've read dover books on relativity and einstein's original abstract – Neerad Nandan · 3 years, 6 months ago

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the speed of light is constant, although light's speed varies depending on where it is. e.g. Light travels at the speed of light in a vacuum but if it travels through glass, it slows down as much as one-third of its usual speed. The speed of light is about 2 996 000 m/s but light's speed depends on where it is. try not to be confused. (Think of speed of light instead as the speed of radio) – Sharky Kesa · 3 years, 6 months ago

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Please do give a proof of physical although mathematical is prefered! – Neerad Nandan · 3 years, 6 months ago

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– Dinesh Chavan · 3 years, 6 months ago

You may read Brief History of Time and clarify your doubtsLog in to reply