In the ideal double-slit experiment,when a glass plate (refractive index $\mu = 1.5$) of thickness $t$ is introduced in the path of one of the interfering beams (wavelength $\lambda$),the intensity at the position where the central maximum occurred previously remains unchanged. The minimum thickness of the glass plate is:
- A$2\lambda$
- B$\frac{2\lambda}{3}$
- C$\frac{\lambda}{3}$
- D$\lambda$
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