In a double slit experiment,when a thin film of thickness $t$ having refractive index $\mu$ is introduced in front of one of the slits,the maximum at the centre of the fringe pattern shifts by one fringe width. The value of $t$ is ($\lambda$ is the wavelength of the light used).
- A$\frac{\lambda}{2(\mu - 1)}$
- B$\frac{\lambda}{(\mu - 1)}$
- C$\frac{\lambda}{(2\mu - 1)}$
- D$\frac{2\lambda}{(\mu - 1)}$
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