Question

The mirror which always produces an erect and virtual image of a real object is:
(A) Concave mirror
(B) Convex mirror
(C) Plane mirror
(D) Concave lens

Answer 1

Hint
A plane mirror is a mirror with a flat (planar) reflective surface. For light rays striking a plane mirror, the angle of reflection equals the angle of incidence. The angle of the incidence is the angle between the incident ray and the surface normal (an imaginary line perpendicular to the surface).

Complete step by step answer
The most common mirrors consist of a plate of transparent glass, with a thin reflective layer on the back (the side opposite to the incident and reflected light) backed by a coating that protects that layer against abrasion, tarnishing, and corrosion.
A plane mirror is made from a few mm thick glass plate. One surface of a glass plate is polished to a high degree of smoothness. This forms the front part of the mirror. And the other (back) surface is silvered (i.e painted with silver, mercury or some other material). Images formed by plane mirrors and convex mirrors are always virtual and erect.

Note
A concave mirror, or converging mirror, has a reflecting surface that is recessed inward (away from the incident light). Concave mirrors reflect light inward to one focal point. They are used to focus light.