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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 about an axis passing through the centre and perpendicular to the plane of the polaroid .

A

`30^@`

B

`45^@`

C

`60^@`

D

`90^@`

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