A mirror that can give an erect and enlarged image of an object is a concave mirror when the object is placed between the pole and the principal focus of the mirror. In this position, the image formed is virtual, erect, and magnified.

Explanation

• When an object is placed between the focal point (F) and the mirror (pole, P) on a concave mirror, the reflected rays diverge in such a way that they appear to come from a larger, upright (erect) virtual image behind the mirror.
• This characteristic makes concave mirrors useful for applications like shaving mirrors, where a magnified and erect image is desirable.

No other common mirror type, such as plane or convex mirrors, can produce both an erect and enlarged image in this manner. This is the well-established optical principle for concave mirrors regarding image formation.