It has been observed that a mirror always forms the image between the pole and the focus, irrespective of the location of the object. Which one of the following is correct in respect of the nature of the mirror?

A convex mirror always forms a virtual, erect and diminished image located between the pole and the focus (behind the mirror), for any position of a real object. A plane mirror forms an image at the same distance behind the mirror as the object is in front, not necessarily between pole and focus. A concave mirror forms images at varied positions depending on object location. Hence the mirror must be convex.