Light of wavelength $\lambda$ in air enters a medium of refractive index $\mu$. Two points in this medium,lying along the path of this light,are at a distance $x$ apart. The phase difference between these points is:
- A$\frac{2\pi \mu x}{\lambda}$
- B$\frac{2\pi x}{\mu \lambda}$
- C$\frac{2\pi (\mu - 1)x}{\lambda}$
- D$\frac{2\pi x}{(\mu - 1)\lambda}$
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