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.

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.

Complete the following sentence:

Angle of deviation is the angle which the …………… ray makes with the direction of …………… ray.