Why in mirrors do you see images backwards?

Look for a discussion of this by Richard Feynman available on Utube.

Little miss me9087's answer

if you are confused by the video- like i was:

Line up two mirrors- so that one is behind you and one is in front of you

You should be able to see the mirror behind you in the mirror in front

now wave your left hand if you look in you should see that in the mirror behind u, u r still waving your left hand NOT YOUR RIGHT.

It is because if you look in the mirror, it is north and south that have been mixed up. Your nose is north on your face but in the mirror it is south!