Question

In the adjacent diagram, AO is a ray of light incident on a rectangular glass block.

(a) complete the path of the ray till it emerges out of the block.

(b) In the diagram, mark the angles of incidence (i) and the angle of refractive index of glass related to the angles and ?

(c) mark angles of emergence by the letter ℯ. How are the angles I and e related?

(d) which two rays are parallel to each other? Name them.

(e) Indicate in the diagram the lateral displacement between the emergent ray and the incident ray.

Answer 1

(a) The complete path of incident ray in glass block is drawn in figure below.

(b) Angle of incidence (i) and angle of refraction (r) are marked in part (a). Refractive index (μ) of glass is related to the angles as

sin i/sin r = 

(c) Angle of emergence (e) is marked in part (a) The two angles are related to each other by the relation

∠i = ∠e

(d) Incident ray and emergent ray are parallel to each other. (e) Lateral displacement is indicated in the figure by XY.