Q.1. The refractive index of glass for light going from air to glass is 3/2. The refractive index of glass for light going from glass to air is : (A) 2/3 (B) 4/3 (C) 3/4 (D) 3 (JEE Mains 2019)
The answer is (A).
The refractive index of glass for light going from air to glass is 3/2. The refractive index of glass for light going from glass to air is 1/n = 2/3.
Q.2. A ray of light is incident on a glass slab at an angle of incidence of 45°. If the refractive index of glass is 1.5, the angle of refraction is : (A) 30° (B) 45° (C) 60° (D) 90° (JEE Mains 2018)
The answer is (B).
The refractive index of glass for light going from air to glass is 1.5. The angle of refraction is sin-1 (1/1.5) = 4
