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MHT CET202014 Oct 2020Evening ShiftPhysicsRay OpticsActual

A ray of light is incident at an angle of incidence 'i' on one surface of a thin prism of small angle 'A'. The ray emerges normally from the opposite surface. If the refractive index of the material of the prism is ' ', the angle of incidence 'i' is nearly equal to

Options

  1. AA
  2. BA 2
  3. CA
  4. DA 2

Correct answer

C. A

Step-by-step solution

= i r = i r ₁ if angles are small. A=r₁+r₂=r₁ since r₂=0 since the ray emerges normally. = i A or i= A

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