1 ) is there any medium in which velocity of light is greater than that in vacuum?
2) what happens to the velocity of light when it goes from denser to rarer medium?
3) what is the refractive index of vacuum?
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1 ) is there any medium in which velocity of light is greater than that in vacuum?
2) what happens to the velocity of light when it goes from denser to rarer medium?
3) what is the refractive index of vacuum?
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