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Q.

A beam of natural light falls on a system of 6 polaroids, which are arranged in succession such that each polaroid is turned through 30° with respect to the preceding one. The  percentage of incident intensity that passes through the system will be

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a

100%

b

50%

c

30%

d

12%

answer is D.

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Detailed Solution

If I is the final intensity and I0 is the initial intensity then I=I02(cos230°)5  or  II0=12×3210=0.12
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A beam of natural light falls on a system of 6 polaroids, which are arranged in succession such that each polaroid is turned through 30° with respect to the preceding one. The  percentage of incident intensity that passes through the system will be