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
D) stretching polyvinyl alcohol and then impregnating with iodine
Correct Answer: D
Solution :When a thin sheet of polyvinyl alcohol is stretched and then impregnating with iodine, H-polaroid is obtained.
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