Which of the following statement(s) is/are correct?
I. A polaroid consists 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.

Options

A. Only I
B. Both II and III
C. Only III
D. All of the above

Answer

D

Explanation

A polaroid consists of long chain molecules aligned in a particular direction.
The electric vectors (associated with the propagating light wave) along the direction of the aligned molecules get absorbed. Thus, if an unpolarised light wave is incident on such a polaroid, then the light wave will get linearly polarised with the electric vector oscillating along a direction perpendicular to the aligned molecules, this direction is known as the pass axis of the polaroid.