The image of an object placed in front of a concave mirror of focal length 15 cm is of the same size

Question

The image of an object placed in front of a concave mirror of focal length 15 cm is of the same size as the object. The distance between the object and its image is\

Professor PC Thomas Classes · Answer

(d): Given, focal length, $f=15 \mathrm{~cm}$\ ∴ $\quad$ Radius of curvature, $R=30 \mathrm{~cm}$\ As image size is same as that of object size, this condition is only valid when object is placed at $C$ (centre of curvature) which means the distance between object and image is zero.\