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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

 4 m

b

8 m

c

6 m

d

12 m

answer is C.

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Detailed Solution

To see the full image minimum height is

H = 12 m 

L=H3=123=4m

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