The path difference between two wavefronts emitted by coherent sour...

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The path difference between two wavefronts emitted by coherent sources of wavelength \( 5460 \AA \) is \( 2.1 \)
\( \mathrm{P} \) micron. The phase difference between the wavefronts

W at that point is -
(1) \( 7.692 \)
(2) \( 7.692 \pi \)
(3) \( \frac{7.692}{\pi} \)
(4) \( \frac{7.692}{3 \pi} \)
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