A ray of light is incident at an angle of 60 ∘ on one face of a prism of angle 30 ∘ . The emergent ray of light makes an angle of 30 ∘ with incident ray. The angle made by the emergent ray with second face of prism will be:

Step-by-step solution

Incidence angle on one face of a prism, i = 60 ° . Angle of the prism, A = 30 ° , the mergent ray that makes an angle 30 ° with incident ray. We know, deviation angle, δ = Angle between the incident ray and emergent ray = 30 ° ⇒ δ = i + e - A ⇒ 30 ° = 60 ° + e − 30 ∘ ⇒ e = 0 ° . So, the angle with the face, = 90 ° .