Two light waves having the same wavelength λ in vacuum are in phase initially. Then the first wave travels a path L1 through a medium of refractive index n1 while the second wave travels a path of length L2 through a medium of refractive index n2. After this the phase difference between the two waves is :

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2πλn1L1−n2L2

2πλL1n1−L2n2

2πλL2n1−L1n2

2πλn2L1−n1L2

answer is A.

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Detailed Solution

Optical path = μl∴ Phase difference = 2πλΔx ϕ=2πλn1L1−n2L2

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