Question

A body is $1.8m$ tall can see his image in a plane mirror fixed on a wall. His eyes are $1.6m$ from the floor level. The minimum length of the mirror to see his full image is

• A. $0.9m$
• B. $0.85m$
• C. $0.8m$
• D. can't be determined

Answer 1

The correct option is A $0.9m$

Seeing yourself completely in a mirror doesn't depend on the distance you are from mirror.

Length of mirror required from geometry is equal to $=IE+EC=\frac{0.2}{2}+\frac{1.6}{2}=0.1+0.8=0.9meter$