Light travels with a velocity 1.5 x 108 m/s in a medium. On entering the second medium its velocity becomes 0.75 x 108 m/s. What is the refractive index of the second medium with respect to the first medium?


 V1 = 1.5 x108 m/s and V2 = 0.75 x108 m/s are given

Hence, 2n1= ?

Apply the equation 2n1= V1/ V2

Replacing with values

2n1= (1.5 x108) / (0.75 x108) 1.5/ 0.75 = 2.

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