1.

The relation between phase difference (Df) and path difference (Dx) is    [MNR 1995; UPSEAT 1999, 2000]

A.            \[\Delta \varphi =\frac{2\pi }{\lambda }\Delta x\]   
B.            \[\Delta \varphi =2\pi \lambda \Delta x\]
C.            \[\Delta \varphi =\frac{2\pi \lambda }{\Delta x}\]   
D.            \[\Delta \varphi =\frac{2\Delta x}{\lambda }\]
Answer» B.            \[\Delta \varphi =2\pi \lambda \Delta x\]


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