1.

Two point sources X and Y emit waves of same frequency and speed but Y lags in phase behind X by 2pl radian. If there is a maximum in direction D the distance XO using n as an integer is given by

A.            \[\frac{\lambda }{2}(n-l)\]
B.            \[\lambda (n+l)\]
C.            \[\frac{\lambda }{2}(n+l)\]
D.            \[\lambda (n-l)\]
Answer» C.            \[\frac{\lambda }{2}(n+l)\]


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