JEE Main 2022 · 26 Jun · Shift 1 · Physics Q56

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PhysicsInteger+4 / -1Question 56 of 90

A light ray is incident, at an incident angle $\theta_1$ , on the system of two plane mirrors $M_1$ and $M_2$ having an inclination angle 75° between them (as shown in figure). After reflecting from mirror $M_1$ it gets reflected back by the mirror $M_2$ with an angle of reflection 30°. The total deviation of the ray will be ______ degree.

Two plane mirrors meeting at 75°: M2 horizontal at the bottom and M1 rising to the upper right; an incident ray comes from the right and strikes M1.

Your answer

Answer and worked solution

Official answer: 210

Two mirrors at angle $\theta$ . After one reflection from each, the total deviation is $360°-2\theta$ .

Value. $360-150=210°$ .

Answer: 210

Topics:Reflection and plane mirrors

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JEE Main 2022 · 26 Jun · Shift 1, Physics question 56