A) 1.231
B) 1.820
C) 1.503
D) 1.414
Correct Answer: D
Solution :
\[\mu =\frac{\sin \,\left( \frac{A+{{\delta }_{m}}}{2} \right)}{\sin \,\left( \frac{A}{2} \right)}\]\[=\frac{\sin \left( \frac{60{}^\circ +30{}^\circ }{2} \right)}{\sin \frac{60{}^\circ }{2}}\]=\[\frac{\sin {{45}^{o}}}{\sin {{30}^{o}}}\]=1.414
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