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Question
A person AB of height 170 cm is standing in front of a plane mirror. His eyes are at height 164 cm. At what distance from P should a hole be made in the mirror so that he cannot see the top of his head.
A person AB of height 170 cm is standing in front of a plane mirror. His eyes are at height 164 cm. At what distance from P should a hole be made in the mirror so that he cannot see the top of his head.
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Solution
The correct option is A 167 cm
The difference between the height of the person and height of the eyes is 6 cm. The reflection of ray will takes place in between the head and the eyes, i.e. at 167 cm height. So if the person should not see his head, a hole should should be made at 167 cm.
The difference between the height of the person and height of the eyes is 6 cm. The reflection of ray will takes place in between the head and the eyes, i.e. at 167 cm height. So if the person should not see his head, a hole should should be made at 167 cm.
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