Question

(43) For the same angle of incidence in media
P. 9 and R, the angles of refraction are 45°, 35°
and 30° respectively. In which medium is the speed
of light minimum ? Give reason for your answer.​

Answer 1

Answer:

30°

Explanation:

We know speed of light(v) is inversely proportional with the medium's refractive index(R.I).

v ∝ 1/R.I.

This means if the angle of refraction is less, then the refractive index is the highest.

So, 30° is the least out of all.

R.I ∝ Speed of light

Now as the refractive index of a medium increases, the speed of light going through that medium decreases. In this case, R.I is the highest. So, the speed of light is the minimum when the angle of refraction is 30°.