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

Options

A. (a) `lambda/2(n-l)`
B. (b) `lambda(n+1)`
C. (c) `lambda/2(n+1)`
D. (d) `lambda(n-1)`

Answer

B

Explanation

For maxima `2pin=(2pi)/(lambda)(XO)-2pil`
or `(2pi)/(lambda)(XO)=2pi(n+l)` or `(XO)=lambda(n+l)`