An Equilateral Prism Deviates A Ray Through 45 Degree For The Two Angles Of Incidence Differing by 20 Degree. What Is The Angle Of Incidence?

Sol:

First angle of incidence = i1 = i

Second angle of incidence = i2 = i1+ 20°

Angle of deviation, d = i1 + i2 – A.

Here A is angle of prism.

⇒ 45 = 2i + 20 – 60

⇒ i = 42.5

⇒ i2  = i + 20 = 62.5

Therefore, the Angle Of Incidence = 62.5

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