Question

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A ray of light is incident on a medium with angle of incidence ‘i’ and is refracted into a secondmedium with angle of refraction ‘r’. The graph of sin i versus sin r is a straight line. Find the ratio of the velocity of light in the first medium to the velocity of light in the second medium.

Answer 1

hey mate
here's the solution

Answer 2

slope tan Ф = sin r/sin i

sin i /sin r = v1/v2

∴v1/v2=cot Ф

this answer may help you.