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Question

A ray of light is incident on a plane mirror at an angle of 30o. At what angle with the horizontal must a plane mirror be placed so that the reflected ray becomes vertically upwards?

A
40o
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B
20o
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C
30o
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D
60o
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Solution

The correct option is C 30oWhen a light ray falls on a mirror at an angle 30o, then the reflected ray will make the same angle with the plane as shown in fig. (i)In order to make the reflected ray vertical, the mirror should be rotated at an angle of 60o.So, the mirror should be tilted by60o2=30o as can be seen in Fig(ii)

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