Question

No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be:
(A) Plane
(B) Concave
(C) Convex
(D) Plane or convex

Answer 1

Hint
Virtual Images are formed when the light rays don’t actually converge but appear to converge at some point. The rays are either parallel or divergent when they are virtual, and can be stretched back to define an imaginary source(image), virtual images are always erect in nature.

Complete step by step answer
A convex mirror is a curved mirror which is also known as a Diverging mirror, it diverges the light falling into it because of its outwards bulged shape. It produces virtual, diminished, and erect images. It does not matter where the object is situated.
A plane mirror has a plane surface. This means the size of the image formed is always the same as the source object. Also since the surface is plane, the light waves coming from a real object do not meet or converge after reflection, they remain parallel. Therefore the image formed in a plane mirror is also always virtual and erect.
A concave mirror is curved inward, and it can produce real as well as virtual images. So depending on the distance of the source object from the mirror, a concave mirror can produce real or virtual, enlarged, or diminished, erect, or inverted. If the object is too close to the mirror, it has a magnified virtual image, at the centre of curvature it forms a real and same sized image, and after this, all images formed are real and diminished in size
By looking at the properties of these mirrors, we can conclude that both plane mirror and convex mirror can form erect images.
So, option (D) is correct.

Note
The nature of images produced by all these mirrors can be reversed if the object is virtual(not real). The light rays coming off a real object are diverging in nature(they originate from a source), but for virtual objects, there is an imaginary source and the rays are converging in nature. Due to this, the behavior of these mirrors reverses when the source object is virtual.