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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 of \( x \) apart. The phase difference between these points is
(a) \( \mu\left(\frac{2 \pi}{\lambda}\right) x \)
(b) \( \frac{1}{\mu}\left(\frac{2 \pi}{\lambda}\right) x \)
(c) \( (\mu-1)\left(\frac{2 \pi}{\lambda}\right) x \)
(d) \( \frac{1}{\mu-1}\left(\frac{2 \pi}{\lambda}\right) x \)
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