The diagram shows five isosceles right-angled prisms. $A$ light ray incident at $90^{\circ}$ at the first face emerges at the same angle with the normal from the last face. Which of the following relations will hold regarding the refractive indices?

  • A
    $\mu _1^2 + \mu _3^2 + \mu _5^2 = \mu _2^2 + \mu _4^2$
  • B
    $\mu _1^2 + \mu _3^2 + \mu _5^2 = 1 + \mu _2^2 + \mu _4^2$
  • C
    $\mu _1^2 + \mu _3^2 + \mu _5^2 = 2 + \mu _2^2 + \mu _4^2$
  • D
    none

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