When you look in the mirror you see yourself right? Well that is true and not true at the same time. You see parts of yourself. When light waves bounce off the mirror at the same angle as they come in then they go into your eye. Then the image is projected upside down in your retina and you mind has to use its prior knowledge of light and shape to fill in the wholes and reverse the image. You know more about physics then you thought, even when you were an infant.