Answer: (b) a convex mirror
A convex mirror, regardless of the object’s position, creates a virtual and smaller image. Using a convex mirror, a full-length image of a distant tall building can be clearly seen.
- A convex mirror is also known as a diverging mirror as this mirror diverges light when they strike its reflecting surface.
- Virtual, erect, and diminished images are always formed with convex mirrors, irrespective of the distance between the object and the mirror.