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Q.

A light ray is incident, at an incident angle θ1, on the system of two plane mirrors M1 and M2 having an inclination angle 75° between them (as shown in figure). After reflecting from mirror M1 it gets reflected back by the mirror M2 with an angle of reflection 30°. The total deviation of the ray will be .............. degree.
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answer is 210.

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Detailed Solution


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θ1=180o-75o-600=45o

δ1=900

δ2=1200

δ=120∘+90∘=210∘

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