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Question

Three circularly shaped linear polarisers are placed coaxially. The transmission axis of the first polariser is at 30o, the second one is at 60o and the third at 90o to the vertical all in the clockwise sense. Each polariser additionally absorbs 10% of the light. If a vertically polarised beam of light of intensity I=100W/m2 is incident on this assembly of polarisers, then the final intensity of the transmitted light will be close to:

A
10W/m2
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B
20W/m2
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C
30W/m2
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D
50W/m2
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Solution

The correct option is C 30W/m2
I1=Io×0.9cos230o=Io×34

I2=I1×0.9cos230o=I1×34

I3=I2×0.9cos230o=I2×34

I3=Io(0.9)3(34)3
I3=30.75Wm2

794518_739633_ans_e4f78879b3324f9888844907084a4b45.JPG

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