STANDARDPhysics-Wave Optics
STANDARD Physics Interference MCQ Question
Type: MCQ-numerical-Medium-Class 12
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
A
1.25
B
1.33
C
1.4
D
1.5
Correct Answer
Option C
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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