A light ray is incident, at an incident angle q₁, 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.

 

 

${\delta }_{total}=360°-2\theta$

= 360 – 2 × 75° = 210°

              Total deviation = $\delta =150°$

 

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