What is the position of the image in the mirror?

The image in a flat mirror is the same distance behind the mirror as the object is

in front of the mirror. That's why it's called a 'virtual' image. It's a pretend, made-up

image that's not real. You can clearly see that for yourself. Simply look around the

back of the mirror, and you'll see that there's no image back there. Your eyes have

fooled your brain into thinking that there is, and that's good enough for most of us.