COMEDK · Physics · 26. Wave Optics

\(\mathrm{H-}\)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
D stretching polyvinyl alcohol and then impregnating with iodine

Verified Solution

Answer & Solution

Correct Answer

(D) stretching polyvinyl alcohol and then impregnating with iodine

Step-by-step Solution

Detailed explanation

\(\mathrm{H}\)-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.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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