State two laws on the basis of which the refraction of light occurs. How is refractive index of medium 2 with respect to medium 1 represented in terms of speed of light in the two media ? If the refractive index of medium 2 with respect to medium 1 is 1·6 and the speed of light in medium 1 is 2 x 10^8 ms–1, find the speed of light in medium 2.
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