Mirror is usually made of glass and it has a smooth surface. One side of the mirror is painted with reflective material due to which light reflects and image appear on the mirror while glass has the transparency at both sides due to which light passes from the glass, as a result, we can see on the other side from the glass and there is no image appear on the glass.
The mirror can be formed by the glass by just coating on the back surface of the glass that produces an image by reflection. This type of mirror can easily make by coating the silver, copper film, and 2 or more than 2 layers of water paint on the 1 side of the float glass. Mirrors used for appearance as well as used in different technologies.