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Wavelength from the position of the second maximum in single slit diffraction

The same question, asked 2 times: 22 Apr 2025 S2*, 19 Apr 2026 S1. Every wording below, oldest first.

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  1. Question 1

    22 Apr 2025 S2

    32
    In a single slit diffraction pattern, the distance between the plane of the slit and screen is 1.3 m. The width of the slit is 0.65 mm and the second maximum is formed at the distance of 2.6 mm from the center of the screen. The wavelength of light used is

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  2. Question 2

    19 Apr 2026 S1

    142
    In a single slit diffraction pattern, the distance between the plane of the slit and the screen is 1.41.4 m. The width of the slit is 0.660.66 mm. The second maximum is formed at the distance of 2.82.8 mm from the center of the screen. The wavelength of light used is

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