Light of wavelength `lambda` in air enters a medium of refractive index `mu`. Two points in this medium, lying along the path of

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 apartThe phase difference between these point is
A. `mu(2pi)/(lamda)x`
B. `1/(mu). (2pi)/(lamda)x`
C. `(mu-1)(2pi)/(lamda)x`
D. `1/((mu-1))(2pi)/(lamda)x`

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

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