Question

what happens when we place a object on the centre of curvature of concave mirror​

Answer 1

Image of an object placed at center of curvature is inverted, real and of the same size and is formed at the center of curvature. Hence image will be real and at the center of curvature (20 cm from mirror).

Answer 2

Answer:

In a spherical mirror, we know the formation of an image depends on the position of the object.

For this question, I am referring a concave mirror.

According to question,

If a mirror is placed on a concave mirror, then the image will be placed on the place where the object is kept but, will be inverted. This means that it will lie below the principal axis, inverted, on the position of the object.

Hope this helps.