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Two polarisers P 1 and P 2 are placed in such a way that the intensity of the transmitted light will be zero. A third polariser P 3 is inserted in between P 1 and P 2 , at particular angle between P 2 and P 3 . The transmitted intensity of the light passing the through all three polarisers is maximum. The angle between the polarisers P 2 and P 3 is

1. 3 
2. 8 
3. 6 
4. 4 

Correct answer: 4 

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