Question

A boy $2\text{m}$ tall stands at a distance $40\text{cm}$ in front of a mirror. He sees an erect image $1\text{m}$ high. The nature of mirror is

• A. concave
• B. convex
• C. plane
• D. either convex or concave

Answer 1

The correct option is B convex

Height of boy $=2\text{m}$
Height of image $=1\text{m}$
$\Rightarrow$ Image is diminished.
However the erect image is always a virtual and diminished in a convex mirror.
In case of plane mirror,
object size = image size