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Q.

A man is 180cm tall and his eyes are 10cm below the top of his head. In order to see his entire height right from toe to head, he uses a plane mirror kept at a distance of 1m from him. The minimum length of the plane mirror required is

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a

85 cm

b

170 cm

c

90 cm

d

180 cm

answer is B.

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Detailed Solution

Height of the mirror is half of the height of the man. 

Height of mirror = height of man 2=1802=90cm

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