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Consider a light beam incident from air ...

Consider a light beam incident from air to a glass slab at Brewster's angle as shown in Fig. EP 10.1.
A polarised is placed in the path of the emergent ray at point P and rotated about an axis passing through the center and perpendicular to the plane of the polaroid.

A

(a) For a particular orientation there shall be darkness observed through the Polaroid.

B

(b) The intensity of light as seen through the Polaroid shall be independent of the rotation.

C

(c) The intensity of light as seen through the Polaroid shall go through a minimum but not zero for two orientation of the polaroid.

D

(d) the intensity of light as seen through the Polaroid shall go through a minimum for four orientation of the Polaroid.

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