A ray of light suffers minimum deviation when incident on a prism having angle of the prism equal to 6 0 ∘ . The refractive index of the prism material is 2 . The angle of incidence (in degrees) is

Question

A ray of light suffers minimum deviation when incident on a prism having angle of the prism equal to 6 0 ∘ . The refractive index of the prism material is 2 ​ . The angle of incidence (in degrees) is ______.

TestHub · Accepted Answer

​ μ = sin ( 2 A ​ ) sin ( 2 A + δ m ​ ​ ) ​ , since A = 6 0 ∘ ∴ δ m = 3 0 ∘ δ m ​ = 2 i − A [ as i = e ] ⇒ i = 4 5 ∘ ​

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