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(D) When a light ray undergoes two successive reflections from two plane mirrors inclined at an angle $	heta$,the total deviation $\delta$ produced i

Vedclass · Accepted Answer

$90$

Vedclass · Answer

(D) When a light ray undergoes two successive reflections from two plane mirrors inclined at an angle $	heta$,the total deviation $\delta$ produced is given by the formula $\delta = 360^{\circ} - 2	heta$.In this problem,the emergent ray is parallel to the incident ray,which means the total deviation $\delta$ is $180^{\circ}$.Substituting this value into the formula:$180^{\circ} = 360^{\circ} - 2	heta$Rearranging the terms to solve for $	heta$:$2	heta = 360^{\circ} - 180^{\circ}$$2	heta = 180^{\circ}$$	heta = 90^{\circ}$Therefore,the angle between the mirrors must be $90^{\circ}$ for the reflected ray to be parallel to the incident ray.

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