Question

How a convex mirror can form a diminished image?

Answer 1

Convex mirror

1. The reflecting surface of a convex mirror is curved outward.
2. Focus is placed behind the mirror.
3. The image is always formed within the focal length.

Formation of image

1. The image produced in a convex mirror is always smaller than the object. In the figure, object OA$>$image IB.
2. It is clear that the image is placed within the focal length and does not depends on the position of the object. If the object is in infinity, then its point image will produce at the focus.

So, a convex mirror can form a diminished image.