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(D) The angle of incidence is given as $i = 30^\circ$.When a light ray strikes a plane mirror,the angle of reflection $r$ is equal to the angle of inc

Vedclass · Accepted Answer

$120$

Vedclass · Answer

(D) The angle of incidence is given as $i = 30^\circ$.When a light ray strikes a plane mirror,the angle of reflection $r$ is equal to the angle of incidence $i$,so $r = 30^\circ$.The total angle of deviation $\delta$ produced by a plane mirror is given by the formula $\delta = 180^\circ - (i + r)$.Since $i = r$,the formula becomes $\delta = 180^\circ - 2i$.Substituting the value of $i$:$\delta = 180^\circ - 2(30^\circ) = 180^\circ - 60^\circ = 120^\circ$.Therefore,the deviation produced by the mirror is $120^\circ$.

$A$ light ray is incident on a plane mirror at an angle of incidence of $30^\circ$. The deviation produced by the mirror is ........$^\circ$.

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