A) 0.433
B) 0.25
C) 0.5
D) 0.75
Correct Answer: A
Solution :
\[\rho =\frac{\cos {{\alpha }_{1}}}{2}\,\,for\,\,{{({{\eta }_{b}})}_{\max }}\] \[\frac{\cos 30{}^\circ }{2}=\frac{0.866}{2}=0.433\]
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