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Where the bright fringes of two wavelengths first coincide

This type of question, asked 5 times: 31 Jan 2023, 6 Apr 2023, 4 Apr 2024, 24 Jan 2025, 28 Jan 2026 S2. All 5 questions below, oldest first.

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  1. Question 1

    31 Jan 2023

    115
    Two light waves of wavelengths 800 and 600 nm600\text{ }nm are used in Young's double slit experiment to obtain interference fringes on a screen placed 7 m7\text{ }m away from plane of slits. If the two slits are separated by 0.35 mm0.35\text{ }mm, then shortest distance from the central bright maximum to the point where the bright fringes of the two wavelength coincide will be ____\_\_\_\_ mm.

  2. Question 2

    6 Apr 2023

    117
    A beam of light consisting of two wavelengths 7000Å7000\text{Å} and 5500Å5500\text{Å} is used to obtain interference pattern in Young's double slit experiment. The distance between the slits is 2.5 mm2.5\text{ }mm and the distance between the plane of slits and the screen is 150 cm150\text{ }cm. The least distance from the central fringe, where the bright fringes due to both the wavelengths coincide, is n×10−5 mn \times10^{- 5}\text{ }m. The value of nn is___

  3. Question 3

    4 Apr 2024

    27
    Two wavelengths λ1\lambda_{1} and λ2\lambda_{2} are used in Young's double slit experiment λ1=450 nm\lambda_{1}= 450\text{ }nm and λ2=650 nm\lambda_{2}= 650\text{ }nm. The minimum order of fringe produced by λ2\lambda_{2} which overlaps with the fringe produced by λ1\lambda_{1} is nn. The value of nn is. ___

  4. Question 4

    24 Jan 2025

    9
    The Young's double slit interference experiment is performed using light consisting of 480 nm and 600 nm wavelengths to form interference patterns. The least number of the bright fringes of 480 nm light that are required for the first coincidence with the bright fringes formed by 600 nm light is :-

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  5. Question 5

    28 Jan 2026 S2

    24
    A beam of light consisting of wavelengths 650 nm and 550 nm illuminates the Young's double slits with separation of 2 mm such that the interference fringes are formed on a screen, placed at a distance of 1.2 m from the slits. The least distance of a point from the central maximum, where the bright fringes due to both the wavelengths coincide, is ____\_\_\_\_ ×10−5 m\times 10^{- 5}\text{ }m.