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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 Figure.

A polaroid is placed in the path of the emergent ray at point P and rotated an axis passing through the centre and perpendicular to the plane of the polaroid.

A

For a particular orientation there shall be darkness as observed through the polaroid.

B

The intensity of light as seen through the polariod shall be independent of the rotation.

C

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

D

The intensity of light as seen through the polaroid shall go through a minimum for four orientations of the polaroid

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The correct Answer is:
C
emergent ray is partially polarised
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