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The relation between phase difference  $ (\Delta \phi) $ and path difference $ (\Delta x) $ is
  • A$\Delta \phi = \frac{{2\pi }}{\lambda }\Delta x$
  • B$\Delta \phi = 2\pi \lambda \Delta x$
  • C$\Delta \phi = \frac{{2\pi \lambda }}{{\Delta x}}$
  • D$\Delta \phi = \frac{{2\Delta x}}{\lambda }$
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