Question

When i1 =i2 in a prism the angle of deviation becomes

Answer 1

The path of the refracted ray inside the prism is in the minimum deviation position when the refracted ray is parallel to the base of the prism and the prism is an equilateral prism.

In the minimum deviation position, the angle of incidence is equal to the angle of emergence. That is, i1=i2i1=i2.

Above is the diagrammatic representation

Answer 2

When i1 =i2 in a prism the angle of deviation becomes equal to the angle of incidence.

Explanation:

• In a prism when light ray enters from one side it forms an anglealong the normal called as angle of incidence and emerges from the other side forming angle of deviation.
• If angles of deviation is equal to the angle of incidence then the prism is quikaterla prims.