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H-polaroid is prepared by

Options

  1. Astretching polyvinyl alcohol and then heated with dehydrating agent
  2. Bstretching polyvinyl alcohol and then impregnating with iodine
  3. Corienting herapathite crystal in the same direction in nitrocellulose
  4. Dby using thin tourmaline crystals

Correct answer

B. stretching polyvinyl alcohol and then impregnating with iodine

Step-by-step solution

H-polaroid is one of the most common type of polaroid used today. It is prepared by stretehing a thin sheet of polyvinyl alcohol and then impregnating it with iodine. In this process, the molecules get oriented in the direction of the applied strain and the material becomes dichronic. Each polaroid sheet is mounted between thin glass plate to provide mechanical support.

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