Question

A man 180cm high stands in front of a plane
mirror. His eyes are at a height of 172cm
from the floor. Then to see his full image for
minimum length of mirror, the lower end of
the mirror should be placed at a height of​

Answer 1

Answer:

HF = height of the man =180cm

E = Eye of human i.e. HE=170cm

Here it can easily be noticed that AE=AH=POBE=OQ=BF

Due to reflection, we need the mirror of the length PQ

Hence the height of the mirror =

2

HF

=90cm

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Answer 2

Explanation:

HF = height of the man =180cm

E = Eye of human i.e. HE=170cm

Here it can easily be noticed that AE=AH=POBE=OQ=BF

Due to reflection, we need the mirror of the length PQ

Hence the height of the mirror =

2

HF

=90cm