Question

A boy finds his image formed at a distance of 10 m from him when standing in front of a plane mirror how far is the mirror from him?

Answer 1

Distance of mirror from the boy.
1-As the distance of the image formed in a mirror is equal to the distance of the object from the mirror.
2-The distance of the image of the boy from the mirror is equal to the distance of the boy from the mirror.
3-As the distance between the boy and his image is $10m$.
4-So the distance between the boy and the mirror is equal to half the distance between the boy and his image.
5-Hence, the distance of the boy and the mirror is $5m.$.

Hence, the distance of the boy and the mirror is $5m.$