A girl is 10cm away from plane mirror if she moves 10cm further away
What will be the distance between the girl and the mirror
What is the distance between the girl and her image
If the girl moves 10cm further away from the plane mirror, the distance between the girl and the mirror will be 20cm (10cm + 10cm = 20cm).
The distance between the girl and her image will always be the same, which is twice the distance between the girl and the mirror. Therefore, the distance between the girl and her image will be 40cm (2 x 20cm = 40cm).