We peek in a mirror to see how we look, but in reality we aren't seeing what we really look like to other people! Try these activities to experiment with mirrors.
Mirrors work by reflecting light that bounces off your face back into your eyes. The resulting image is reversed, or backwards. When you look at yourself in the mirror, you see everything on the opposite side from how another person sees you. The picture from a camera shows an unreversed image of your face, but if you look at a reflection of the picture in the mirror, it will be reversed again.
A mirror code would be pretty hard to write in, if you only have 9 or 11 letters to work with! Of course, you could just learn how to write your alphabet backwards and write your letters that way!
Stand in front of the bathroom mirror, then hold up the handheld mirror in front of you so it faces the bathroom mirror, too. How many "yous" do you see? You probably see too many of you to count. This is because the handheld mirror reflects the reflection in the bathroom mirror which reflects the reflection of the handheld mirror...and on and on!
Even though a bathroom mirror reverses your image, it is still a fairly accurate representation of what you look like. Not all mirrors are that way, though. If you've ever been in the "funhouse" at the fair, you know that sometimes mirrors can make you look very strange indeed. These mirrors are curved. If the mirror is curved out toward you, it is a concave and will make you look tall and skinny. You probably don't have carnival mirrors in your house, but try looking at your reflection in a large soup spoon. Does your reflection look different on the back of the spoon than on the front?