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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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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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