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Angle of the first secondary maximum when the first minimum of a single slit is at 30 degrees

The same question, asked 3 times: May 2022 S1*, 10 May 2023 S1*, 9 May 2024 S1. Every wording below, oldest first.

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  1. Question 1

    May 2022 S1

    40
    In a Fraunhofer diffraction at a single slit of width dd and incident light of wavelength 5500 Å, the first minimum is observed at an angle 30°. The first secondary maxima is observed at an angle θ\theta equal to

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  2. Question 2

    10 May 2023 S1

    12
    In a diffraction pattern due to single slit of width 'a', the first minimum is observed at an angle 30∘30^\circ when light of wavelength 5000 A˚5000\,\text{Å} is incident on the slit. The first secondary maximum is observed at an angle (sin⁡30∘=12)\left(\sin 30^\circ=\frac{1}{2}\right)

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  3. Question 3

    9 May 2024 S1

    44
    In a diffraction pattern due to single slit of width 'aa', the first minimum is observed at an angle of 30∘30^\circ when the light of wavelength 5400 Å is incident on the slit. The first secondary maximum is observed at an angle of (sin⁡30∘=12\sin30^\circ=\frac{1}{2})

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