Question

Light takes t₁ sec to travel a distance x in vacuum and the
same light takes t₂ sec to travel 10 cm in a medium. Critical
angle for corresponding medium will be
(a) sin⁻¹ (10 t₂/t₁X) (b) sin⁻¹ (t₂ X/10 t₁)
(c) sin⁻¹ (10 t₁/t₂ X)(d) sin⁻¹ (t₁X/10 t₂)

Answer 1

v = 10/t2

sin i = 1/n = v/c

c = x /t1

sin i = 10/t2 x t1/x

       = 10t1/ t2x

sin⁻¹ (10 t₁/t₂ X)

Answer 2

Answer:

Option (C) is the correct answer.