A) \[a\,\,\sin \theta =n\lambda \]
B) \[a\,\,\sin \theta =(2n-1\frac{\lambda }{2})\]
C) \[a\,\,\sin \theta =(2n-1)\lambda \]
D) \[a\,\,\sin \theta =\frac{n\lambda }{2}\]
Correct Answer: B
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