In the diagram below, PQ is a ray of light incident on a rectangular glass block.

In the diagram, the angle of incidence is marked by letter 'i' and the angle of emergence by the letter 'e’.

How are the angles' i’ and 'e’ related to each other?

Q.

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

(a) Complete the path of the ray till it emerges out of the slab.

(b) In the diagram, mark the angle of incidence (i) and the angle of refraction (r) at the first interface. How is the refractive index of glass related to the angles i and r ?

(c) Mark angle of emergence by the letter e. How are the angles i and e related ?

(d) Which two rays are parallel to each other ?

(e) Indicate in the diagram the lateral displacement between the emergent ray and the incident ray. State one factor that affects the lateral displacement.

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

(a) Complete the path of the ray till it emerges out of the slab.
(b) In the diagram, mark the angle of incidence (i) and the angle of refraction (r) at the first interface. How is the refractive index of glass related to the angles i and r ?
(c) Mark angle of emergence by the letter e. How are the angles i and e related ?
(d) Which two rays are parallel to each other ?
(e) Indicate in the diagram the lateral displacement between the emergent ray and the incident ray. State one factor that affects the lateral displacement.

Q.

The given diagram shows a ray of light incident on an equilateral glass prism placed in minimum deviation position. How are angle of incidence and angle of emergence related to each other in this position of the prism?

Q.

Draw the diagrams to show the refraction of light from (i) air to glass, and (ii) glass to air. In each diagram, label the incident ray, refracted ray, the angle of incidence (i) and the angle of refraction (r).