Image is produced in a plane mirror by reflection. It is a virtual image, that is, it can only be seen in the mirror but cannot be projected on a screen like an image produced by a concave mirror or a lens. Every point on the virtual image corresponds to a point on the object in front of the mirror, but since the object and the image face each other we get the illusion of lateral inversion that is, the right side of the object appears to become left in the image. For the same reason, written or printed alphabets appear reverse when seen reflected in a mirror, except a few symmetrical alphabets such as M, O, W, T and Y.