Which of the following statements is/are correct? I. A polaroid con...

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Which of the following statements is/are correct?
I. A polaroid consist of long chain molecules aligned in a particular direction.

II. Electric vectors along the direction of the aligned molecule in a polaroid gets absorbed.
III. An unpolarised light wave is incident on polaroid, then it will get linearly polarised.
(a) Only I
(b) II and III
(c) Only III
(d) I, II and III
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