Question

For the same angle of incidence in media A, B and C , the angles of refraction are 20°, 30°, and 40° respectively. In which medium will the velocity of light be maximum ? Give reason in support of your answer.

Answer 1

in C Because the refractive index is small in C

Answer 2

From Snell’s law

n = sin i /sin r = c/v

Since c and sin i are constant therefore sin r is directly proportional to v

Therefore velocity of light is maximum in medium C.

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