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Point on the screen directly in front of one slit: dark fringe or intensity there

This type of question, asked 5 times: 27 Jun 2022, 29 Jan 2023, 29 Jan 2024, 24 Jan 2026 S2, 5 Apr 2026 S2. All 5 questions below, oldest first.

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  1. Question 1

    27 Jun 2022

    23
    In Young's double slit experiment the two slits are 0.6 mm0.6\text{ }mm distance apart. Interference pattern is observed on a screen at a distance 80 cm80\text{ }cm from the slits. The first dark fringe is observed on the screen directly opposite to one of the slits. The wavelength of light will be ____\_\_\_\_ nmnm.

  2. Question 2

    29 Jan 2023

    18
    In a Young's double slit experiment, two slits are illuminated with a light of wavelength 800 nm800\text{ }nm. The line joining A1PA_{1}P is perpendicular to A1A2A_{1}A_{2} as shown in the figure. If the first minimum is detected at PP, the value of slits separation 'a' will be: The distance of screen from slits D=5 cmD = 5\text{ }cm

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  3. Question 3

    29 Jan 2024

    26
    In a double slit experiment shown in figure, when light of wavelength 400 nm400\text{ }nm is used, dark fringe is observed at PP. If D=0.2 mD = 0.2\text{ }m. the minimum distance between the slits S1S_{1} and S2S_{2} is ____ mmmm.

  4. Question 4

    24 Jan 2026 S2

    17
    In the Young's double slit experiment the intensity produced by each one of the individual slits is I0I_{0}. The distance between two slits is 2 mm. The distance of screen from slits is 10 m. The wavelength of light is 6000Å6000\text{Å}. The intensity of light on the screen in front of one of the slits is ____\_\_\_\_ .

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  5. Question 5

    5 Apr 2026 S2

    17
    The maximum intensity in a Young's double slit experiment is I0I_{0}. Distance between the slits (d) is 5λ5\lambda, where λ\lambda is the wavelength of light used. The intensity of the fringe, exactly opposite to one of the slits on the screen, placed at D=10 dD = 10\text{ }d is ____\_\_\_\_

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