A) \[36\sqrt{5}\]
B) \[4\sqrt{5}\]
C) \[36\sqrt{7}\]
D) \[36/\sqrt{7}\]
Correct Answer: D
Solution :
[d] \[\sin {{i}_{c}}=\frac{1}{\mu }=\frac{r}{\sqrt{{{r}^{2}}+{{h}^{2}}}}\] \[\text{Using }h=12cm,\mu =4/3\] \[\text{We get }r=\frac{36}{\sqrt{7}}cm.\]
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