[CBSE PMT 1996; AIIMS 2001]
A) 2l
B) l/2
C) l/6
D) l/3
Correct Answer: C
Path difference $ \Delta =\frac{\lambda }{2\pi }\times \varphi =\frac{\lambda }{2\pi }\times \frac{\pi }{3}=\frac{\lambda }{6} $
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