A ray of light is incident on a plane mirror | vedclass

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Question

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

Vedclass · Accepted Answer

$120$

Vedclass · Answer

(D) The angle of incidence $i$ is given as $30^\circ$.When a light ray reflects from a plane mirror,the angle of reflection $r$ is equal to the angle of incidence $i$,so $r = 30^\circ$.The total angle turned by the ray (deviation $\delta$) is given by the formula $\delta = 180^\circ - (i + r)$.Substituting the values,we get $\delta = 180^\circ - (30^\circ + 30^\circ) = 180^\circ - 60^\circ = 120^\circ$.Alternatively,the deviation produced by a plane mirror is $\delta = 180^\circ - 2i = 180^\circ - 2(30^\circ) = 120^\circ$.

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

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