To look total image of a person, the minimum height of a plane mirror is

Correct answer: (b) Half of the height of a person

Explanation

By the laws of reflection, a plane mirror needs a minimum height equal to half the height of a person to show the full image.

Rays from the head and feet strike the mirror at its midpoints, so only half the body length of glass is required.

This result is independent of how far the person stands from the mirror.