Mirrors

 Mirrors have a thin layer of silver coat at he back with the coating of red or orange paint. the paint covers the silvering and prevents it from being rubbed. 

When you look in the mirror, light arriving at yuour eyes is coming from the silvered surface. This gives the impression that the image is somewhere behind the mirror.

To see the full size of an object, the mirror should be at least half of the height of the object. 

Mirrors are used in light houses. They reflect light a long way to  help ships at sea.