The relation between phase difference \( (\Delta \phi) \) and \( \m...

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The relation between phase difference \( (\Delta \phi) \) and
\( \mathrm{P} \) path difference \( (\Delta x) \) is

W.
(1) \( \Delta \phi=\frac{2 \pi}{\lambda} \Delta x \)
(2) \( \Delta \phi=2 \pi \lambda \Delta x \)
(3) \( \Delta \phi=\frac{2 \pi \lambda}{\Delta x} \)
(4) \( \Delta \phi=\frac{2 \Delta x}{\lambda} \)
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