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Fringe width when the Young's experiment is immersed in a liquid

This type of question, asked 5 times: 28 Jun 2022, 26 Jul 2022, 22 Jan 2025, 24 Jan 2025, 5 Apr 2026 S1. All 5 questions below, oldest first.

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  1. Question 1

    28 Jun 2022

    113
    In a Young's double slit experiment, an angular width of the fringe is 0.35∘0.35^{\circ} on a screen placed at 2 mm away for particular wavelength of 50 nm50\text{ }nm. The angular width of the fringe, when whole system is immersed in a medium of refractive index 7/57/5, is 1α\frac{1}{\alpha}. The value of α\alpha is

  2. Question 2

    26 Jul 2022

    5
    In young's double slit experiment, the fringe width is 12 mm12\text{ }mm. If the entire arrangement is placed in water of refractive index 43\frac{4}{3}, then the fringe width becomes (in mmmm )

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  3. Question 3

    22 Jan 2025

    4
    Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : If Young's double slit experiment is performed in an optically denser medium than air, then the consecutive fringes come closer. Reason (R) : The speed of light reduces in an optically denser medium than air while its frequency does not change. In the light of the above statements, choose the most appropriate answer from the options given below :

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  4. Question 4

    24 Jan 2025

    76
    Young's double slit interference apparatus is immersed in a liquid of refractive index 1.44. It has slit separation of 1.5 mm . The slits are illuminated by a parallel beam of light whose wavelength in air is 690 nm . The fringe-width on a screen placed behind the plane of slits at a distance of 0.72 m , will be :

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  5. Question 5

    5 Apr 2026 S1

    14
    In Young's double slit experiment, the fringes width of the interferences pattern produced on the screen is 2.4μ m2.4\mu\text{ }m. If the experiment is carried out in another medium having refractive index 1.2, the fringe width will be ____\_\_\_\_ μm\mu m.

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