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Number of fringes in the same region when the wavelength is changed

The same question, asked 2 times: 20 Apr 2025 S1*, 18 Apr 2026 S1. Every wording below, oldest first.

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  1. Question 1

    20 Apr 2025 S1

    15
    In Young's double slit experiment, when light of wavelength 600 nm is used, 18 fringes are observed on the screen. If the wavelength of light is changed to 400 nm , the number of fringes observed on the screen is

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  2. Question 2

    18 Apr 2026 S1

    142
    In a certain region of the screen, number of fringes formed is observed to be 8 in Young's double slit experiment when light of wavelength 6600 A˚6600\ \mathrm{\mathring{A}} is used. If the light of wavelength 4400 A˚4400\ \mathrm{\mathring{A}} is used, the number of fringes observed in the same region of the screen will be

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