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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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Fraction of intensity from 3rd polarises $\frac{I_{0} / 4}{2 I_{0}} = \frac{1}{8}$

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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 ?