An object viewed using a flat mirror appears to be located behind the mirror, because to the observer the diverging rays from the source appear to come from behind the mirror.

The images reflected in flat mirrors have the following properties:

Real Image where the light ray actually come to a focus you can actually see the object projected on a screen placed at that location

Virtual Image no light rays actually come directly from a virtual image, they just appear to the eye to do so. (When you see yourself in the mirror, are you actually located behind it as you appear?)

To figure out what happens: draw rays, use law of reflection, use geometry