question_answer

The plane of a mirror makes an angle of \[30{}^\circ \] with horizontal. If a vertical ray is incident on a mirror, then what is the angle between mirror and reflected ray?

A) \[60{}^\circ \]

B) \[90{}^\circ \]

C) \[45{}^\circ \]

D) \[30{}^\circ \]

Correct Answer: A

Solution :

[a]

Angle between incident ray and mirror

By law of reflection \[\angle i=\angle r\]

So, angle of reflection \[\angle r={{30}^{o}}\]

Hence, angle between mirror and reflected ray \[={{60}^{o}}\]