H-polaroid is prepared by (a) using thin tourmaline crystals (b) orienting herapathite crystal in the direction of nitrocellulose
H-polaroid is prepared by
(a) using thin tourmaline crystals
(b) orienting herapathite crystal in the direction of nitrocellulose
(c) stretching polyvinyl alcohol and then impregnating with iodine
(d) stretching polyvinyl alcohol and then heating with dehydrating agent
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The correct option is (c) stretching polyvinyl alcohol and then impregnating with iodine.
Explanation:
We know that H-polaroid is prepared by stretching a thin sheet of polyvinyl alcohol and then impregnating with iodine. In this process, the molecules get oriented in the direction of the applied strain and the material becomes dichronic, Each polaroid sheet rs mounted between thin glass plates, so as to provide mechanical support.
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