Optics Question 160

Question: 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

Options:

A) $ \frac{\lambda }{2}(n-l) $

B) $ \lambda (n+l) $

C) $ \frac{\lambda }{2}(n+l) $

D) $ \lambda (n-l) $

Show Answer

Answer:

Correct Answer: B

Solution:

For maxima $ 2\pi n=\frac{2\pi }{\lambda }(XO)-2\pi l $

or $ \frac{2\pi }{\lambda }(XO)=2\pi (n+l) $ or $ (XO)=\lambda (n+l) $



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