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For light wave, \( \lambda \) is the wavelength, \( \delta \) is the phase difference between two points on the wave
P
separated by a distance of \( \Delta \). The relationship
W
between, \( \lambda, \delta \) and \( \Delta \) is
(1) \( \Delta=\frac{2 \pi}{\lambda} \delta \)
(2) \( \Delta=\frac{\lambda}{2 \pi} \delta \)
(3) \( \delta=\frac{\Delta}{\lambda} \)
(4) \( \delta=\frac{\Delta \pi}{\lambda} \)
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