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JEE Main20199 Jan 2019Evening ShiftPhysicsRay OpticsActual

Two plane mirrors are inclined to each other such that a ray of light incident on the first mirror M 1 and parallel to the second mirror ( M 2 ) is finally reflected from the second mirror ( M 2 ) and parallel to the first mirror M 1 . The angle between the two mirrors will be:

Options

  1. A60 o
  2. B45 o
  3. C90 o
  4. D75 o

Correct answer

A. 60 o

Step-by-step solution

As given in question A B | | C O ∴ ∠ A B F = θ From laws of reflection ∠ O B C = θ Similarly C D ‖ O B ∴ ∠ D C E = θ Again from laws of reflection, ∠ O C B = θ ∴ 3 θ = 180 o ⇒ θ = 60 o

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