how is refractive index of any medium a with respect to b related to the speed of propagation of light in two medium a and b? state the name of this constant when one medium is vacuum or air , the refractive indices of glass and water with respect to vacuum are 3/2 and 4/3 respectively . if the speed of the light in glass is 2×10^8m/s , find the speed of the light in vacuum and water
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