Question

What will be the angle of deviation through a prism and 60°, when angles of incidence and emergence are 45° each?

Answer 1

Answer:

Least angle of deviation (or angle of minimum deviation) is 36 degrees.

Angle i denotes angle of incidence.

Angle e denotes angle of emergence.

i + e = Angle of prism + Angle of deviation

Here, in case of minimum deviation, where the prism angle is 60 degrees, i and e would be equal to each other.

So, 2i = A + Angle of deviation

2 (48) = 60 + Angle of deviation

96 - 60 = Angle of deviation

36 degrees is equal to the angle of deviation. 

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Explanation:

Answer 2

Angle of deviation is 36 degree