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Change in fringe width when the wavelength of light is changed

The same question, asked 2 times: 25 Apr 2025 S2*, 12 May 2026 S1. Every wording below, oldest first.

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  1. Question 1

    25 Apr 2025 S2

    18
    In a biprism experiment a steady interference pattern is observed on the screen using a light of wavelength 5000Å5000\text{Å}. Without disturbing the setup of the experiment, the source of light is replaced by a source of wavelength 6400Å6400\text{Å}. The fringe width will

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  2. Question 2

    12 May 2026 S1

    144
    In Young's double slit experiment, the fringe width is 2.42.4 mm with light of wavelength 90009000 A.U. If the light of wavelength 54005400 A.U. is used, with no other change in the experimental set up. The change in fringe width is

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