Not because of a pimple or an unfortunate haircut, but because you notice the mirror is beginning to develop strange black ...

Everyone knows about reflecting light with a mirror, which is a property of materials like metals, but specific structures can cause the light to behave in a way that creates rather amazing results.

Reflection involves a source of light and a surface. The light travels towards the surface and bounces off of it.Mirrors reflect lots of light, but most objects reflect at least a bit of light.