A) \[{{\sin }^{-1\grave{\ }}}\left[ \frac{{{n}_{1}}}{{{n}_{2}}}\cos \left( {{\sin }^{-1}}\left( \frac{{{n}_{2}}}{{{n}_{1}}} \right) \right) \right]\]
B) \[{{\sin }^{-1\grave{\ }}}\left[ {{n}_{1}}\cos \left( {{\sin }^{-1}}\left( \frac{1}{{{n}_{2}}} \right) \right) \right]\]
C) \[{{\sin }^{-1}}\left( \frac{{{n}_{1}}}{n{{ }_{2}}} \right)\]
D) \[{{\sin }^{-1}}\left( \frac{{{n}_{2}}}{n{{ }_{1}}} \right)\]
Correct Answer: A
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