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A third polaroid between two polaroids (crossed or at an angle): transmitted intensity

This type of question, asked 6 times: 29 Jan 2023, 31 Jan 2023, 10 Apr 2023, 27 Jan 2024, 4 Apr 2025, 4 Apr 2026 S2. All 6 questions below, oldest first.

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  1. Question 1

    29 Jan 2023

    21
    As shown in the figure, three identical polaroids P1,P2P_{1},P_{2} and P3P_{3} are placed one after another. The pass axis of P2P_{2} and P3P_{3} are inclined at angle of 60∘60^{\circ} and 90∘90^{\circ} with respect to axis of P1P_{1}. The source SS has an intensity of 256Wm2256\frac{W}{m^{2}}. The intensity of light at point OO is ____\_\_\_\_ Wm2\frac{W}{m^{2}}.

  2. Question 2

    31 Jan 2023

    7
    Two polaroids A and B are placed in such a way that the pass-axis of polaroids are perpendicular to each other. Now, another polaroid CC is placed between AA and BB bisecting angle between them. If intensity of unpolarized light is I0I_{0} then intensity of transmitted light after passing through polaroid BB will be:

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  3. Question 3

    10 Apr 2023

    21
    Unpolarised light of intensity 32Wm−232Wm^{- 2} passes through the combination of three polaroids such that the pass axis of the last polaroid is perpendicular to that of the pass axis of first polaroid. If intensity of emerging light is 3Wm−23Wm^{- 2}, then the angle between pass axis of first two polaroids is ____\_\_\_\_ degrees.

  4. Question 4

    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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  5. Question 5

    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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  6. Question 6

    4 Apr 2026 S2

    17
    An unpolarized light of certain intensity passes through a combination of two polarizers whose transmission axes are at 30∘30^{\circ} and 90∘90^{\circ}, respectively, with respect to the horizontal axis. A third polarizer with its transmission axis at 60∘60^{\circ} with the horizontal axis is placed between the two existing polarizers. The ratio of the output intensities with and without the third polarizer is ____\_\_\_\_.

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