When you look into a mirror and see the reflected light, your brain thinks there is a light source behind the mirror. We call this a virtual image. A virtual image is an image formed by light coming from an apparent light source. The light is not arriving at or coming from the actual image location.
using equal perpendicular lines to locate an image
lateral inversion
S A L T
what is lateral inversion?
the orientation of an image in a plane mirror backwards and reversed