Question

Under minimum deviation condition in a prism if a ray is incident at an angle 30,the angle between the emergent ray and the second refracting surface of the prism is

Answer 1

Answer:60°

Step-by-step explanation:

For minimum deviation

Angle of incidence=Angle of emergence

90°-30° = angle between emergent ray and refracting surface

Answer 2

Given:

A ray is incident at an angle = 30°

To Find:

The second refracting surface of the prism

Solution:

Condition for the minimum deviation phenomenon = i1 = i2

Thus, the angle of emergence = i2 = 30°

As, this is the angle between the normal to the prism and also the emergent ray, hence -

angle between the prism surface and the emergent ray will be -

2∠i

= 2 × 30

= 60

Answer: the second refracting surface of the prism is 60°