A) About 20°
B) 30°
C) 60°
D) 45°
Correct Answer: B
Solution :
\[\mu =\frac{\sin \left( \frac{A+{{\delta }_{m}}}{2} \right)}{\sin \left( \frac{A}{2} \right)}\]\[\Rightarrow \sqrt{2}\mu =\frac{\sin \left( \frac{60+{{\delta }_{m}}}{2} \right)}{\sin \left( \frac{60}{2} \right)}\] \[\Rightarrow \sqrt{2}\times \sin 30=\sin \,\left( \frac{60+{{\delta }_{m}}}{2} \right)\Rightarrow \sin {{45}^{o}}\] \[=\sin \,\left( \frac{60+{{\delta }_{m}}}{2} \right)\Rightarrow {{\delta }_{m}}={{30}^{o}}\]
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