Question

. Calculate the angle of refraction of light ray incident on surface of a plastic slab of refractive index √3, if the angle of
incidence is 60⁰. (Given: Sin 30⁰ = 1/2 and Sin 60⁰ = √3/2)

Answer 1

Answer:

Given;

Angle of refraction(r) = 30°. Angle of incidence = i. Refractive index (μ) = √3. Refractive index (μ) = s i n i s i n r sinisinr

⇒ √3 = s i n i s i n 30 = s i n i 1 2 sinisin30=sini12

⇒ √3 = 2×sin i

⇒ sin i = √ 3 2 √32

⇒ i = 60°

Hence angle of incidence is 60°.