Question

for the Same angle of incidence, the angle
of refration in three media P, Q R are
45°, 35° and 15° respectively In Which
medium will the velocity of light be
(a) Minimum (b) Maximum
​

Answer 1

Answer:

Let the refractive index of the medium be n and speed of light in air is c.

Using Snell's law of refraction : n

air

×sini=n

medium

×sinr where n

air

=1

∴ 1×sini=n×sinr ⟹n=

sinr

sini

Velocity of light in a medium v=

n

c

=

sini

c×sinr

⟹v∝sin r

Thus velocity of light is minimum in medium A.

Explanation:

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