Question

A man 180 cm high stands in front of a plane mirror. His eyes are at a height of 172 cm 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
(a) 86 cm from the floor
(b) 94 cm from the floor
(c) 4 cm from the floor
(d) 8 cm from the floor​

Answer 1

Answer:

8 cm from the floor.

Explanation:

beacous it's should be placed at the height

Answer 2

Answer:

HF = height of the man = 180cm

E = Eye of human i.e. HE = 172cm

To find - Length of the mirror

Hence the height of the mirror = HF/2

Therefore, Length of the mirror =90cm

And From lower end it will be 8cm from the floor