Question

the distance between an object kept 20 CM away from a plane mirror and its image is​

Answer 1

Answer:

As the object was initially placed 20 cm in front of the plane mirror, the image formed was 40 cm away from the original object.

Now, when the mirror is moved 2 centimeters towards the object, the image also moves towards the object. In this perspective, the distance of the image from the object will be 18+18 = 36 cm

So, distance between the original and final images = 40 cm - 36 cm = 4 cm