$A$ plate of thickness $t$ made of a material of refractive index $\mu$ is placed in front of one of the slits in a double slit experiment. What should be the minimum thickness $t$ for which the intensity at the centre of the fringe pattern is zero?
- A$\frac{(\mu - 1)\lambda}{2}$
- B$(\mu - 1)\lambda$
- C$\frac{\lambda}{2(\mu - 1)}$
- D$\frac{\lambda}{(\mu - 1)}$
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