A) \[{{\sin }^{-1}}(4/3)\]
B) \[{{\tan }^{-1}}(4/3)\]
C) \[{{\sin }^{-1}}(3/4)\]
D) 90°
Correct Answer: C
Solution :
Semi vertical angle \[=C={{\sin }^{-1}}\left( \frac{1}{\mu } \right)={{\sin }^{-1}}\left( \frac{3}{4} \right)\]
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