A real image of an object is to be obtained. The mirror required for this purpose is:(a) convex (b) concave (c) plane (d) either convex or concave

(b) concave

Explanation

A real image of an object can only be obtained by concave mirror.

Among all the six cases, it forms a real image in five cases, only in one case it forms a virtual image, which is when the object is placed between pole $(P)$ and focus $(F)$.