A) \[{{90}^{o}}\]
B) \[{{60}^{o}}\]
C) \[{{45}^{o}}\]
D) \[{{30}^{o}}\]
Correct Answer: C
Solution :
\[R=4H\cot \theta ,\]if R = 4H then \[\cot \theta =1\Rightarrow \theta =45{}^\circ \]
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