Explain Polarisation.
Explain the difference between polarised and unpolarised lights.

Explanation

Uses of polaroids :
(i) These are used in sunglasses. They protect eyes from the glare.
(ii) These are used in wind shields of automobiles. It protects the eyes of driver from dazzling light of approaching vehicles.
(iii) These are used in the window of trains and aeroplanes. They help to control the light entering through the window.
(iv) These are used in three dimensional motion pictures.