Two point sources X and Y emit waves of same frequency and speed but Y lags in phase behind X by \(2\pi l\) radian. If there is a maximum in direction D the distance XO using n as an integer is given by
1
\(\lambda \left( {n - l} \right)\)
2
\(\dfrac{\lambda }{2}\left( {n + l} \right)\)
3
\(\lambda \left( {n + l} \right)\)
4
\(\dfrac{\lambda }{2}\left( {n - l} \right)\)
5
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