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Q.

A beam of unpolarised light is incident on a tourmaline crystal C1. The intensity of the emergent light is I0 and it is incident on another tourmaline crystal C2. It is found that no light emerges from C2. If now C1 is rotated through 45º to the axis of transmission of C2, the intensity of the light emerging from C2 is

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a

Zero

b

c

d

answer is C.

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Detailed Solution

Angle between the axes of transmission of C1 and C2 is 900. Emergent light from C1 is plane polarised light.After C1 is rotated through 450, the plane of polarisation of emergent light from C1 makes an angle of 450 with the axis of transmission of C2.Using Malu's law, intensity of emergent light from C2
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