Question

for the same angle of incidence, the angles of refraction in media P, Q, R, S are 50°, 40°, 30°, 20° respectively. The speed of light is minimum in medium?
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Answer 1

Answer:

Medium S

Explanation:

Velocity of light in air is c

Velocitu of light in medium, v = c/ n

n is the refractive index of the medium

According to snells law, 1×sin i = n × sin r

n = sin i / sin r

Therefore v = c sin i / sin r

V is proportional to r

As for medium S, r = 20° which is minimum

So V is minimum in medium S