In a Young's double-slit experiment,a thin plate of thickness $2 \times 10^{-6} \ m$ and refractive index $\mu = 1.5$ is placed in the path of one of the slits. By how many fringe widths does the central bright fringe shift? The wavelength of the light used is $5000 \ \mathring{A}$.
- A$2$ fringes upward.
- B$2$ fringes downward.
- C$10$ fringes upward.
- DNone of these.
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DifficultMHT CET 2023
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