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Two polaroids P1 and P2 are placed with their axis perpendicular to each other. Unpolarised light I0, is incident on P1. A third polaroid P3 is kept in betweenP1 and P2 such that its axis makes an angle 45° with that of P1. The intensity of transmitted light through P2 is

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a

I04

b

I08

c

I016

d

I02

answer is B.

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Detailed Solution

The intensity of transmitted light through P1I1=Io2The intensity of transmitted light through P3I2=I1cos245°=Io2122=Io2·12=Io4 Angle between polaroids P3 and P2=90°-45°=45°∴ Intensity of transmitted light through P2 , I3=I2cos245°=Io4122=Io8

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