If the image formed by a mirror is upright and diminished irrespective of the distance between the object and the mirror, what can you say about the type of mirror?
Convex mirror
Convex mirror always forms virtual, upright and diminished image irrespective of the position of the object in front of the mirror.
Image formation when the object is anywhere in front of the convex mirror is shown below.
Position of Image: Behind the mirror
Size of Image: Smaller than the object
Nature of Image: Virtual and erect