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There are four layers of glass plates, placed on top of each other such that bottom one has thickness a ₁ and refractive index n ₁=2.7 . Next one has thickness a ₂ and refractive index n ₂=2.43 . The third one and the top one have thickness a ₃ and a ₄ and refractive indices n ₃ and n ₄ respectively. Three rays starting at the same moment from A ₁, ~A ₂ and A ₃ reach points B ₂, ~B ₃, ~B ₄ at the same time, with thei

Options

  1. An ₃=1.968
  2. Bn ₄=1.291
  3. Ca ₂=7.243 ~mm
  4. Da ₃=11.51 ~mm

Correct answer

D. a ₃=11.51 ~mm

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