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Q.

Two polaroids are aligned with their axes of transmission making an angle of 45°. They are followed by a third polaroid whose axis of transmission makes an angle of 90° with the first polaroid. What fraction of the incident unpolarised  light  passes through all three ?

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a

1/16

b

1

c

1/8

d

1/2

answer is C.

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Detailed Solution

Question Image

Fraction of intensity from 3rd polarises I0/42I0=18

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