Question

magnification produced by a mirror is +3, then the nature of image

Answer 1

convex is the answer
hope it will help you

Answer 2

The positive sign here, indicates that the image is virtual, that is the image is formed on the other side of the mirror.

The value '3' indicates that the image formed is enlarged, that is the image is 3 times as big as the object.

Thus, the nature of the image is Virtual, erect and enlarged.

This image can be formed by a concave mirror, when the object is placed between the principal focus and the pole of the mirror.

Hope it helps!!