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(B) When two plane mirrors are placed at an angle $	heta$,the total deviation $\delta$ produced by two successive reflections is given by $\delta = 3

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parallel to the original ray

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(B) When two plane mirrors are placed at an angle $	heta$,the total deviation $\delta$ produced by two successive reflections is given by $\delta = 360^{\circ} - 2	heta$.Given that the mirrors are perpendicular,$	heta = 90^{\circ}$.Substituting the value of $	heta$ in the formula:$\delta = 360^{\circ} - 2(90^{\circ}) = 360^{\circ} - 180^{\circ} = 180^{\circ}$.$A$ deviation of $180^{\circ}$ means the final ray is directed exactly opposite to the incident ray,which implies the emergent ray is parallel to the incident ray.

Two plane mirrors are perpendicular to each other. $A$ ray after suffering reflection from the two mirrors will be

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