What is the angle of incidence for a ray of light which suffers minimum deviation of 36 degree through an equilateral prism *?

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What should be the angle of incidence for a ray of light which suffers a minimum deviation of 36o through an equilateral prism?

[Hint: A = 60°, i = (A + δmin)/2]

Given , 

Angle of prism , A = 60° 

Angle of minimum deviation , δmin  = 36°

Angle of incidence , i = ?

As  δmin  = 2i - A

36° = 2i- 60

i = 48°

Concept: Refraction of Light Through a Rectangular Glass Slab

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