The critical angle for a typical glass air interface is 42^ . If a ray of light falls normally on one of the faces of the prism of angle 45^ . The emergent ray will:

Step-by-step solution

Given critical angle C = 42^ . Angle of prism A = 45^ . Since the ray falls normally on the first face, the angle of incidence i₁ = 0^ . Thus, the angle of refraction at the first face r₁ = 0^ . Using the relation for a prism, r₁ + r₂ = A . Substituting the values, 0^ + r₂ = 45^ r₂ = 45^ . The angle of incidence at the second face is 45^ . Since r₂ > C ( 45^ > 42^ ), the ray will undergo total internal reflection at the second face. Answer: Undergo total internal reflection from the second face