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Screen distance needed to keep the same fringe width when the slit separation changes

The same question, asked 2 times: 10 May 2024 S1*, 12 May 2024 S1. Every wording below, oldest first.

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  1. Question 1

    10 May 2024 S1

    24
    In Young's double slit experiment the separation between the slits is doubled without changing the other settings of the experiment. To obtain the same fringe width, the distance DD of the screen from the slits should be made

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  2. Question 2

    12 May 2024 S1

    30
    In two separate setups for Biprism experiment using same wavelength, fringes of equal width are obtained. If ratio of slit separation is 2:3 then the ratio of the distance between the slit and screen in the two setups is

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