A Student carries out the experiment of tracing the path of a ray of light through a rectangular glass slab for two different values of angle of incidence ∠i = 30° and ∠i = 45°. In the two cases the student is likely to observe the set of values of angle of refraction and angle of emergence as:

[A] ∠r = 30°, ∠e = 20° and ∠r = 45°, ∠e = 28°

[B] ∠r = 30°, ∠e = 30° and ∠r = 45°, ∠e = 45°

[C] ∠r = 20°, ∠e = 30° and ∠r = 28°, ∠e = 45°

[D] ∠r = 20°, ∠e = 20° and ∠r = 28°, ∠e = 28°