The angle of prism A is given as:

1. r₁ - r₂
2. i₁ + i₂
3. r₁ + r₂
4. r₁ / r₂

The angle of deviation becomes minimum when:

1. i₁ = r₁
2. i₁ = r₂
3. i₁ = i₂
4. r₂ = i₂

In position of minimum deviation, the refracted ray inside the prism is …………… to its base:

1. normal
2. inclined at 45°
3. parallel
4. none of the above

Mention the incorrect statement:

1. The angle of deviation produced by a prism depends on the colour or wavelength of the light used.
2. The angle of incidence also affects the angle of deviation produced by the prism.
3. In a prism as well as a parallel sided glass slab the emergent ray is parallel to the incident ray with a lateral displacement.
4. The angle of deviation of prism is also affected by the material of the prism.