Question

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

1. Complete the path of the ray till it emerges out of the slab.
2. 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?
3. Mark angles of emergence by the letter e. How are the angles i and e related?
4. Which two rays are parallel to each other? Name them.
5. Indicate in the diagram the lateral displacement between the emergent ray and the incident ray. State one factor that affects the lateral displacement.

Answer 1

1. The ray's path through the glass slab is complete.
2. `""^amu_g = "R.I glass" = sin i/sin r`
   
3. Angle of emergence ∠e is marked ∠i = ∠e
4. Emergent ray BD and incident ray AO are parallel.
5. DE shows the lateral displacement.
   The following factors affect lateral displacement:
   
   1. The angle of incidence.
   2. The glass slab's (or medium's) thickness.
   3. Refractive index of glass.