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Four long glass plates with refractive indices n ₁> n ₂> n ₃> n ₄ are stacked in parallel as shown in the figure. A light ray, traveling in the first plate, is incident on the second plate at an angle . This ray passes through second and third plates but does not enter the fourth plate. Then, the minimum value of is

Options

  1. A⁻¹ ( n₄ n₁ )
  2. B⁻¹ ( n₄ n₃ )
  3. C⁻¹ ( n₁ n₃ )
  4. D⁻¹ ( n ₂ n ₃ )

Correct answer

A. ⁻¹ ( n₄ n₁ )

Step-by-step solution

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