Question

In the case of refraction of light from a rectangular glass slab, if i is the angle of incidence and e is the angle of emergence, then

• A. e = i
• B. e < i
• C. e > i
• D. i $\ne$ e

Answer 1

The correct option is A

e = i

Angle of emergence should be equal to angle of incidence, this criteria is needed for smooth refraction in a rectangular glass slab. Angle of emergence is the angle formed by a light ray that emerges from the second surface of a prism and a line parallel to the incident ray and the angle of incidence is the angle which an incident line or ray makes with a perpendicular to the surface at the point of incidence