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Q.

A polaroid examines two adjacent plane polarized beams A and B whose planes of polarization are mutually perpendicular. In the first position of the analyzer, beam B shows zero intensity. From this position a rotation of 30o shows that the two beams have same intensity. The ratio of intensities of the two beams IA and IB will be

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a

1 : 3

b

1:3

c

3 : 1

d

3:1

answer is A.

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Detailed Solution

Ia cos2300=Ib cos2600

IaIb=cos2600cos2300=1434=13

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