No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be

1. plane
2. concave
3. convex
4. either plane or convex

Answer:(d)
either plane or convex,: A convex mirror always gives a virtual and erect image of smaller size than the object placed in front of it. Similarly, a plane mirror always gives a virtual and erect image of same size as that of the object placed in front of it. Therefore, the given mirror could be either plane or convex.