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Wave Optics

Question

A ray of light is incident on a 60^o prism at the minimum deviation position. The angle of refraction at the first face (ie, incident face) of the prism is

zero

30^o

45^o

60^o

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Solution

30^o

The refracting angle of prism
A = r₁ + r₂
For minimum deviation

r₁ = r₂ = r
A = 2r
r = A/2 = 60^o/2 = 30^o