<P> A plane mirror is made using some highly reflecting and polished surface such as a silver or aluminum surface in a process called silvering . After silvering, a thin layer of red lead oxide is applied at the back of the mirror . The reflecting surface reflects most of the light striking it as long as the surface a remains uncontaminated by tarnishing or oxidation . Most modern plane mirrors are designed with a thin piece of plate glass that protects and strengthens the mirror surface and helps prevent tarnishing . Historically, mirrors were simply flat pieces of polished copper, obsidian, brass, or a precious metal . Mirrors made from liquid also exist, as the elements gallium and mercury are both highly reflective in their liquid state . </P> <P> Mathematically, a plane mirror can be considered to be the limit of either a concave or a convex spherical curved mirror as the radius, and therefore the focal length, becomes infinite . </P>

Write a table which shows relation between mirrors and images are formed by the mirror