the speed of light in air is slightly less than speed of light in vacuum true or false
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Light in air is 1.0003 times slower than light in a vacuum, which slows it all the way down from 299,792,458 meters per second to 299,702,547 meters per second. ... But if you're in a vacuum, the index of refraction is precisely 1; there is no change to the speed of light in a vacuum.
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