The refracting angle of prism is 60° and the angle of deviation is 30°. In the position of minimum deviation, the angle of incidence i₁ and the angle of emergence i₂ are :

1. i₁ = 45°, i₂ = 30°
2. i₁ = 30°, i₂ = 45°
3. i₁ = 45°, i₂ = 45°
4. i₁ = 30°, i₂ = 30°

Assertion (A): If the angles of the base of a prism are equal, then in the position of minimum deviation, the refracted ray will pass parallely to the base of the prism.

Reason (R): For minimum deviation, angle of incidence is equal to the angle of emergence.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true and R is not the correct explanation of A.
3. assertion is false but reason is true.
4. assertion is true but reason is false.

State whether the following statement is 'true' or 'false'.

The deviation produced by a prism is independent of the angle of incidence and is same for all the colours of light.

How does the angle of minimum deviation produced by a prism change with increase in (i) the wavelength of incident light and (ii) the refracting angle of the prism?