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# A ray of light is incident at $30^{\circ}$ on the plane mirror. What is the angle between mirror and reflected ray ?

$(a)\;30^{\circ} \\ (b)\;60^{\circ} \\ (c)\;20^{\circ} \\ (d)\;90^{\circ}$

Since angle of incidence = angle of reflection
$\angle NOR= 30^{\circ}$
$\therefore \angle ROB = 90-30^{\circ}$
$\qquad=60^{\circ}$
Hence b is the correct answer.