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Light of wavelength \( \lambda \) in air enters a medium of
\( \mathrm{P} \) refractive index \( \mu \). Two points in this medium, lying

W. along the path of this light, are at a distance \( \mathrm{x} \) apart. The phase difference between these points is :
(1) \( \frac{2 \pi \mu x}{\lambda} \)
(2) \( \frac{2 \pi x}{\mu \lambda} \)
(3) \( \frac{2 \pi(\mu-1) x}{\lambda} \)
(D) \( \frac{2 \pi x}{(\mu-1) \lambda} \)
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