Question:

If the speed of light in a medium is 1.5 x 108 m/s, what is the absolute refractive index of the medium?

Answer:

 Data given is speed of light in a medium (v) = 1.5 x 108 m/s

And assume that speed of light in vacuum as c= 3 x 108 m/s

Then, absolute refractive index of the medium (n) = c/v

Hence, n= (3 x 108) / (1.5 x 108) = 3 / 1.5 = 2

Thus, the absolute refractive index of the medium is 2.

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