Fill in the blank :​
One surface of mirror is made opaque by ______ it followed by a thin coating of paint of lead oxide.​

Q. One surface of a mirror is made opaque by silvering it following by a thin coat of red lead oxide paint.

Q. A piece of glass can be used as a mirror by coating on one of its surfaces.

Q. Fill in the blanks :

Q. Which element made a brilliant mirror when it is painted on glass

Q. The refractive index of the material of a prism is $\sqrt{2}$ and the angle of the prism is ${30}^o$. One of the two refracting surface of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is?