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KCET2011PhysicsRay Optics

A prism having refractive index 1.414 and refracting angle 30^ has one of the refracting surfaces silvered. A beam of light incident on the other refracting surface will retrace its path, if the angle of incidence is

Options

  1. A0^
  2. B30^
  3. C60^
  4. D45^

Correct answer

D. 45^

Step-by-step solution

At second surface, there is no refraction so r₁=A=30^ From Snell's law aligned n=& i₁ r₁ n=& i₁ 30^ i₁ &= 2 1 2 = 1 2 i₁ &= 1 2 i₁ &=45^ aligned

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