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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

a
12 m
b
8 m
c
4 m
d
6 m

detailed solution

Correct option is C

Height of mirror = h3=123=4 cm

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