No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be
Either plane or convex
Explanation for correct option:
Correct option : d) Either plane or convex
Plane mirrors -These mirrors always form a real, almost proportional, and erect image.
The image formed by a plane mirror- ERECT
Convex mirrors- These are spherical mirrors that form virtual, diminished, and erect images in all cases.
The image formed by a convex mirror- ERECT
Explanation for Incorrect options:
Option C:
It cannot be a concave mirror since concave mirrors produce an inverted image in general.
The image formed by concave mirror-INVERTED
An erect image can be produced by plane or convex mirror only therefore option D is right.