Question

absolute refractive indices of two media a and b are 2 and 1.5 respectively if the speed of light in medium b is 2×10^8m/s calculate the speed of light

Answer 1

speed of light =speed in vacuum/refractive index
2x10^8=speed in vacuum of light/1.5
speed in vacuum of light=3x10^8m/s

now 
speed in medium A=speed in vacuum/refractive index
=3x10^8/2=1.5x10^8m/s

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