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Q.

A person standing in the centre of a room, 12 m high looks into a plane mirror fixed on the wall. Then the minimum length of the plane mirror for him to see the full length image of the wall behind him, is equal to

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a

12 m

b

8 m

c

4 m

d

6 m

answer is C.

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Detailed Solution

Minimum length of the mirror to see the image behind the man when he is standing at the middle of the room is h/3. where h is the height of the wall.

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