Question

A student very cautiously traces the path of a ray through a glass slab for different values of the angle of incidence (∠i). He then measures the corresponding values of the angle of refraction (∠r) and the angle of emergence (∠e) for every value of the angle of incidence. On analysing these measurements of angles, his conclusion would be
(A) ∠i > ∠r > ∠e
(B) ∠i = ∠e > ∠r
(C) ∠i < ∠r < ∠e
(D) ∠i = ∠e < ∠r

Answer 1

Explanation:

his conclusion would be a I think

Answer 2

B) ∠i = ∠e > ∠r

Explanation:

When light is refracted through a glass slab, angle of incidence = angle of emergence. So ∠i = ∠e >. The light passes from rarer medium (air) to the denser medium (glass). So the light ray will bend towards the normal. Hence angle of refraction will be less than the angle of incidence or angle of emergence.

Option B is the answer. ∠i = ∠e > ∠r