ABSTRACT
Why is it that when you look into a mirror you get a left-right but not a top-bottom reversal? The mirror does not work like a lens that inverts an image. Of course, as you think about it, you come to realize that a mirror image doesn't really reverse left and right sides of objects, whereas inverting lenses do — unless you are using the lens as a magnifying glass, in which case you do not get the left—right reversal.
