List the uses of polaroids.

Explanation

(i) Polaroids are used in goggles and cameras to avoid glare of light.(ii) Polaroids are useful in three dimensional motion pictures i.e., in holography. (iii) Polaroids are used to improve contrast in old oil paintings. (iv) Polaroids are used in optical stress analysis. (v) Polaroids are used as window glasses to control the intensity of incoming light. (vi) Polarised laser beam acts as needle to read/write in compact discs (CDs). (vii) Polaroids produce polarised lights to be used in liquid crystal display (LCD).