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  4. Two coherent sources of light interfere and produce fringe pattern on a screen. For central maximum, the phase difference between the two waves will be

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Q. Two coherent sources of light interfere and produce fringe pattern on a screen. For central maximum, the phase difference between the two waves will be

NEETNEET 2020Wave Optics

Solution:

For central maximum, path difference is zero for both coherent sources in interference.
Hence, phase difference $=\frac{2 \pi}{\lambda} \times$ path difference
$ =\frac{2 \pi}{\lambda} \times 0=0 $