A person AB of height 170 cm is standing...

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 mirror so that he cannot see his hair?

167 cm

161 cm

163 cm

None of these

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The correct Answer is:

To see top of head , a ray should start from top of head and enter the eye as shown . If that point of incidence of mirror is punched, the head cannot be seen. From the ray diagram the hole has to be punched on mirror at 3 cm from top end

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