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     EduGorilla 
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    Interference fringes were produced in Young’s double slit experiment using light of wavelength 5000 . When a film of material 2.5 x 10-3 cm thickness was placed over one of the slits, the fringe pattern shifted by a distance equal to 20 fringe widths. Which of the following represents the refractive index of material of the film?

    Options :-

    1. 1.25
    2. 1.33
    3. 1.4
    4. 1.5
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