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Angle of prism is A and its one surface is silvered. Light rays falling at an angle at incidence 2 A on first surface return back through the same path after suffering reflection at second silvered surface What is the refractive index of material?

  1. tan A
  2. 2 sin A
  3. 2 cos A
  4. A over 2

The correct answer is: 2 cos A

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