A) \[2nt\,\cos \,r=\left( m-\frac{1}{2} \right)\lambda \]
B) \[2nt\,\cos \,r=m\lambda \]
C) \[nt\,\cos \,r=\left( m-\frac{1}{2} \right)\lambda \]
D) \[nt\,\cos \,r=m\lambda \]
Correct Answer: A
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