A) \[30{}^\circ \]
B) \[45{}^\circ \]
C) \[60{}^\circ \]
D) \[75{}^\circ \]
Correct Answer: C
Solution :
\[\mu =\frac{\sin \left( \frac{A+{{\delta }_{m}}}{2} \right)}{\sin \frac{A}{2}}\] \[\sqrt{3}=\frac{\sin \left( \frac{60{}^\circ +{{\delta }_{m}}}{2} \right)}{\sin \frac{60{}^\circ }{2}}\] \[\Rightarrow \] \[\frac{\sqrt{3}}{2}=\sin \left[ 30{}^\circ +\frac{{{\delta }_{m}}}{2} \right]\] \[\Rightarrow \] \[{{\delta }_{m}}=60{}^\circ \]
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