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Deviation of a ray reflected by plane mirrors

This type of question, asked 2 times: 26 Jun 2022, 11 Apr 2023. All 2 questions below, oldest first.

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  1. Question 1

    26 Jun 2022

    26
    A light ray is incident, at an incident angle θ1\theta_{1}, on the system of two plane mirrors M1M_{1} and M2M_{2} having an inclination angle 75∘75^{\circ} between them (as shown in figure). After reflecting from mirror M1M_{1} it gets reflected back by the mirror M2M_{2} with an angle of reflection 30∘30^{\circ}. The total deviation of the ray will be ____\_\_\_\_ degree.

  2. Question 2

    11 Apr 2023

    100
    When one light ray is reflected from a plane mirror with 30∘30^{\circ} angle of reflection, the angle of deviation of the ray after reflection is:

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