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Path or phase difference at a point and which bright or dark fringe forms there

This type of question, asked 4 times: 10 May 2024 S1, 13 May 2024 S2, 13 May 2026 S2, 14 May 2026 S2. All 4 questions below, oldest first.

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  1. Question 1

    10 May 2024 S1

    14
    Two sources of light are 0.6 mm apart and a screen is placed at a distance of 1.2 m from them. Light of wavelength 6000 Å is used. The phase difference between the two light waves interfering on the screen at a point 3 mm from the central bright band is

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  2. Question 2

    13 May 2024 S2

    15
    The path difference between two identical light waves at a point Q on the screen is 3 μm [the paper leaves the number out; 3 μm is the value its answer requires]. If the wavelength of the waves is 5000 Å, then at point Q there is

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  3. Question 3

    13 May 2026 S2

    142
    Two coherent sources PP and QQ produce interference at a point AA on the screen where there is a dark band which is formed between 4th4^{th} bright band and 5th5^{th} bright band. Wavelength of light used is 6000 A˚6000\ \mathrm{\mathring{A}}. The path difference between PAPA and QAQA is x×10−4x \times 10^{-4} cm. The value of xx is

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  4. Question 4

    14 May 2026 S2

    142
    The distance of a point on the screen from two slits in biprism experiment is 1.8×10−51.8 \times 10^{-5} m and 1.23×10−51.23 \times 10^{-5} m. If wavelength of light used is 6000 A˚6000\ \mathrm{\mathring{A}} the fringe number formed at that point is

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