A) 60°
B) 75°
C) 45°
D) None of these
Correct Answer: D
Solution :
Here \[\frac{{{n}_{1}}-{{n}_{2}}}{{{n}_{1}}}=\frac{0.88}{100}\] Þ \[\frac{{{n}_{2}}}{{{n}_{1}}}=0.9912\] \ Critical angle \[{{\theta }_{c}}={{\sin }^{-1}}\left( \frac{{{n}_{2}}}{{{n}_{1}}} \right)={{\sin }^{-1}}(0.9912)=84{}^\circ 24'\]
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