MIRROR

Basically mirror anything with a smooth surface that reflects almost all of the light that hits it with only very little light absorbed or scattered  can be a mirror. The key factor is a smooth surface, because rough surfaces scatter light instead of reflecting it.

Source : pixabay.com

HOW IT WORKS??

When photon are coming from an object strike the smooth surface of a mirror, they bounce back at the same angle. Your eyes see these reflected photons as a mirror image. The mirror image is reversed, which you can easily see if you stand in front of a mirror with a shirt with words on it. The words on the shirt appear backwards in the mirror.