Two light waves having the same wavelength $\lambda$ in vacuum are in phase initially. Then the first wave travels path $L_1$  through a medium of refractive index $n_1$    while the second wave travels a path of length $L_2$  through a medium of refractive index $n_2$ . After this the phase difference between the two waves is:

<p>Kindly go through the solution&nbsp;</p><p><span contenteditable="false">&nbsp;<math> <mi>? </mi> <mo>=</mo> <mfrac> <mrow> <mrow> <mn>2</mn> <mi>π</mi> </mrow> </mrow> <mrow> <mrow> <mi>λ</mi> </mrow> </mrow> </mfrac> <mo>×</mo> <mi mathvariant="normal">Δ</mi> <mi>x</mi> <mo>=</mo> <mfrac> <mrow> <mrow> <mn>2</mn> <mi>π</mi> </mrow> </mrow> <mrow> <mrow> <mi>λ</mi> </mrow> </mrow> </mfrac> <mfenced open=" [" close="]" separators="|"> <mrow> <mrow> <msub> <mrow> <mrow> <mi>n</mi> </mrow> </mrow> <mrow> <mrow> <mn>1</mn> </mrow> </mrow> </msub> <msub> <mrow> <mrow> <mi>L</mi> </mrow> </mrow> <mrow> <mrow> <mn>1</mn> </mrow> </mrow> </msub> <mo>-</mo> <msub> <mrow> <mrow> <mi>n</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <msub> <mrow> <mrow> <mi>L</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> </mrow> </mrow> </mfenced> </math> </span></p>

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