Q158 / 180 · COMEDK 2013 · Physics

$\mathrm{H-}$polaroid is prepared by

A
orienting herapathite crystal in the same direction in nitrocellulose
B
using thin tourmaline crystals
C
stretching polyvinyl alcohol and then heated with dehydrating agent
Correct answer
D
stretching polyvinyl alcohol and then impregnating with iodine

Solution

$\mathrm{H}$-polaroid is prepared by stretching a thin sheet of polyvinyl alcohol and then impregnating with iodine. In this process, the molecules are oriented in the direction of applied strain.

Hence, the correct answer is option: 'D'.

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