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A polaroid between two crossed polaroids: angle for maximum transmitted intensity

The same question, asked 2 times: 27 Jan 2024, 4 Apr 2025. Every wording below, oldest first.

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  1. Question 1

    27 Jan 2024

    106
    When a polaroid sheet is rotated between two crossed polaroids then the transmitted light intensity will be maximum for a rotation of:

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  2. Question 2

    4 Apr 2025

    90
    Two polarisers P1P_{1} and P2P_{2} are placed in such a way that the intensity of the transmitted light will be zero. A third polariser P3P_{3} is inserted in between P1P_{1} and P2P_{2}, at the particular angle between P2P_{2} and P3P_{3}. The transmitted intensity of the light passing the through all three polarisers is maximum. The angle between the polarisers P2P_{2} and P3P_{3} is :

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