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KVPY2010PhysicsRay Optics

Three trparent media of refractive indices ₁, ₂, ₃ respectively, are stacked as shown. A ray of light follows the path shown. No light enters the third medium. Then-

Options

  1. A₁ < ₂ < ₃
  2. B₂ < ₁ < ₃
  3. C₁ < ₃ < ₂
  4. D₃ < ₁ < ₂

Correct answer

D. ₃ < ₁ < ₂

Step-by-step solution

At first incidence light is deviated towards the normal therefore ₂> ₁ . Also at second incidence TIR takes place therefore ₂> ₃ , also ₁> ₃ because for the same angle in medium ₂ , angle in ₁ medium is less. ₃ < ₁ < ₂

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