STANDARD Physics Interference MCQ Question
Interference fringes were produced in Young's double slit experiment using light of wavelength 5000 Å. When a film of material 2.5 × 10⁻³ cm thick ' was placed before one of the slits, the fringe pattern shifted by a distance equal to 20 fringe widths. The refractive index of the material of the film is
1.25
1.33
1.4
1.5
Correct Answer
Detailed Explanation
The shift in fringe pattern is given by Δx = (μ - 1)t/λ. Given Δx = 20β and β = λD/d, solving gives μ = 1.4.
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