If sun is the source of light then is it possible that the speed of light might increase depending on the mediums its going through or its not possible.
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1possible duplicate of What is the mechanism behind the slowdown of light/photons in a transparent medium? – Gonenc May 12 '15 at 20:56
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The speed of light in a vacuum, or c, is 299,792,458 meters per second. Any other medium will slow light down. For example light takes about 40% more time to go through glass than vacuum. But media that would increase the velocity of light would violate fundamental laws of physics and can therefore not exist.
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