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(C) The angle between the mirror and the horizontal surface is $30^\circ$.The incident ray is vertical,meaning it makes an angle of $90^\circ$ with th

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$60$

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(C) The angle between the mirror and the horizontal surface is $30^\circ$.The incident ray is vertical,meaning it makes an angle of $90^\circ$ with the horizontal.The angle between the incident ray and the mirror surface is $90^\circ - 30^\circ = 60^\circ$.According to the law of reflection,the angle of incidence equals the angle of reflection.Since the angle of incidence (angle between incident ray and normal) is $90^\circ - 60^\circ = 30^\circ$,the angle of reflection (angle between reflected ray and normal) is also $30^\circ$.The angle between the reflected ray and the mirror surface is $90^\circ - 30^\circ = 60^\circ$.

$A$ plane mirror makes an angle of $30^\circ$ with the horizontal. If a vertical ray strikes the mirror,find the angle between the mirror and the reflected ray.

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