Question

Angle of incidence is 45° in the condition of minimum deviation for a prism of refracting angle 60°. find the angle of deviation.​

Answer 1

Angle of minimum deviation= 2i-A= 2 x 45-60= 90-60= 30

Answer 2

The angle of deviation is 30 degrees.

Explanation:

Given that,

Angle of incidence, i = 45°

The refracting angle of the prism, r = 60°

We need to find the angle of deviation of the prism. We know that the relation between the angle of incidence, angle of deviation and the angle of prism. It is given by :

$\delta=2i-r$

$\delta=2(45)-60$

$\delta =30^{\circ}$

So, the angle of deviation is 30 degrees. Hence, this is the required solution.

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