Question

Diagram alongside shows an equilateral prism and a ray PQ, incident on the face AB. Copy the diagram and on it show

1. refracted ray
2. emergent ray
3. angle of incidence
4. angle of refraction face AB
5. angle of emergence
6. angle of deviation
7. Relation between angle of incidence, angle of emergence, angle of prism and angle of deviation.

Answer 1

1. Refracted ray: QR, bends towards the normal N₁ inside the prism.
2. Emergent ray: RS, bends away from the normal N₂ on leaving face AC.
3. Angle of incidence: i, between PQ and normal N₁.
4. Angle of refraction at face AB: r₁, between QR and normal N₁.
5. Angle of emergence: e, between RS and normal N₂.
6. Angle of deviation: δ, at D, between the incident ray PQ extended forward and the emergent ray RS extended backward. These dashed extensions meet at D.
7. Relation: \[ i + e = A + \delta \]