A) \[{{\sin }^{-1}}\frac{4}{5}\]
B) \[{{\sin }^{-1}}\frac{5}{4}\]
C) \[{{\sin }^{-1}}\frac{1}{2}\]
D) \[{{\sin }^{-1}}\frac{2}{1}\]
Correct Answer: B
Solution :
Refracting index of water with respect to glass \[_{g}{{n}_{\omega }}=\frac{_{a}{{n}_{g}}}{_{a}{{n}_{\omega }}}=\frac{5}{3}\times \frac{3}{4}=\frac{5}{4}\] Critical angle \[C={{\sin }^{-1}}\frac{5}{4}\]
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