Given:
Height of object, h = 120 cm
Distance of object = 100 cm
Let's find the distance of the image formed by the plane mirror mirror.
The distance of an image can be said to be two times the distance between the mirror and the object when the image is reflected in a lane mirror.
To find the distance of the image formed by the mirror, we have:
Distance of image formed = 2 x distance between the mirror and the object.
Hence, we have:
Distance of image formed = 2 x 100 = 200 cm
The distance between the image formed and the object will be 200 cm, while the distance between the image formed and the mirror will be 100 cm behind the mirror.
ANSWER:
100 cm behind the mirror.