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Fringe width when the double slit set-up (1 mm, 1.33 m, 6300 A) is immersed in water

The same question, asked 3 times: 11 May 2024 S1, 15 Apr 2026 S2, 12 May 2026 S2. Every wording below, oldest first.

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  1. Question 1

    11 May 2024 S1

    19
    A double slit experiment is immersed in water of refractive index 1.33. The slit separation is 1 mm, distance between slit and screen is 1.33 m. The slits are illuminated by a light of wavelength 6300 Å. The fringe width is

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  2. Question 2

    15 Apr 2026 S2

    142
    A double slit experiment is immersed in water of refractive index 1.331.33. The slit separation is 1 mm, distance between slit and screen is 1.331.33 m. The slits are illuminated by light of wavelength 6300 A˚\mathrm{\mathring{A}}. The fringe width is

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  3. Question 3

    12 May 2026 S2

    143
    A double slit experiment is immersed in water of refractive index 1.331.33. The slit separation is 11 mm, distance between slit and screen is 1.331.33 m. The slits are illuminated by a light of wavelength 6300 A˚6300\ \mathrm{\mathring{A}}. The fringewidth is x×10−4 mx \times 10^{-4}\,m. The value of ′x′'x' is

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