A boy of height 1.5 m with his eye level at 1.4 m stands before a plane mirror of length 0.75 m fixed on the wall. The height of the lower edge of the mirror above the floor is 0.8 m. Then :

Question

A boy of height 1.5 m with his eye level at 1.4 m stands before a plane mirror of length 0.75 m fixed on the wall. The height of the lower edge of the mirror above the floor is 0.8 m. Then : (A) The boy will see his full image (B) The boy cannot see his hair (C) The boy cannot see his feet (D) The boy cannot see neither his hair nor his feet

Tardigrade Admin · Accepted Answer

<img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/physics/b22763f412bb848cddd49b8debea4f34-.png" /> ( MP / PC )=( AB / BC ) ∴ ( MP /2 x )=(0.8/ x ) or MP =1.6 m >1.4 m Hence, the boy cannot see his feet.

Q. A boy of height $1.5 m$ with his eye level at $1.4 m$ stands before a plane mirror of length $0.75 m$ fixed on the wall. The height of the lower edge of the mirror above the floor is $0.8 m$ . Then :

The boy will see his full image

The boy cannot see his hair

The boy cannot see his feet

The boy cannot see neither his hair nor his feet

$\frac{MP}{PC} = \frac{A B}{BC}$
$∴ \frac{MP}{2 x} = \frac{0.8}{x}$
or $MP = 1.6 m > 1.4 m$
Hence, the boy cannot see his feet.

Q. A boy of height 1.5m with his eye level at 1.4m stands before a plane mirror of length 0.75m fixed on the wall. The height of the lower edge of the mirror above the floor is 0.8m. Then :