KCET 2004 Physics Solved Paper

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Question : 7 of 60

Marks: +1, -0

H - polaroid is prepared by

stretching polyvinyl alcohol and then heated with dehydrating agent
stretching polyvinyl alcohol and then impregnating with iodine.
orienting herapathite crystal in the same direction in nitrocellulose.
by using thin tourmaline crystals.

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