Glass has refractive index μ with respect to air and the critical angle for a ray of light going from glass to air is θ . If a ray of light is incident from air on the glass with angle of incidence θ , corresponding angle of refraction is

Step-by-step solution

Refractive index of glass with respect to air = μ Critical angle = θ ∴ μ = 1 s i n θ …. (i) When a ray of light incident from air on the glass with angle of incidence θ . If r the angle of refraction, then by Snell’s law, μ = s i n θ s i n r ⇒ s i n r = s i n θ μ = 1 / μ μ [from Eq. (i)] s i n r = 1 μ 2 r = s i n - 1 1 μ 2