Two light waves having the same waveleng...

Two light waves having the same wavelength `lambda` in vacuum are in phase initially. Then the first ray travels a path of length `L_(1)` through a medium of refractive index `mu_(1)`. Then second ray travels a path of length `L_(2)` throug a medium of refractive index `mu_(2)`. The two waves are then combined to observed interference effects. The phase difference between the two, when they interfere, is

`(2pi)/lamda(L_1/mu_1-L_2/mu_2)`

`(2pi)/lamda(L_2-L_1)`

`(2pi)/lamda(mu_2L_1-mu_1L_2)`

`(2pi)/lamda(mu_1L_1-mu_2L_2)`

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