A) \[1/\sqrt{2}\]
B) \[\sqrt{2}\]
C) \[2\sqrt{2}\]
D) \[1/2\sqrt{2}\]
Correct Answer: B
Solution :
\[A={{60}^{o}},\,\,{{\delta }_{m}}={{30}^{o}}\] As \[\mu =\sin \frac{\left( \frac{1+{{\delta }_{m}}}{2} \right)}{\sin \left( \frac{A}{2} \right)}\] \[\therefore \] \[\mu =\sin \frac{\frac{({{60}^{o}}+{{30}^{o}})}{2}}{\sin \left( \frac{{{60}^{o}}}{2} \right)}=\frac{\sin {{45}^{o}}}{\sin {{30}^{o}}}\] \[=\frac{1/\sqrt{2}}{1/2}=\frac{2}{\sqrt{2}}=\sqrt{2}\]
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