1.

The refractive index of water is 4 / 3 and that of glass is 5/3.  What will be the critical angle for the ray of light entering water from the glass                                                                 [RPMT 1996]

A. \[{{\sin }^{-1}}\frac{4}{5}\]
B. \[{{\sin }^{-1}}\frac{5}{4}\]
C. \[{{\sin }^{-1}}\]\[\frac{1}{2}\]
D. \[{{\sin }^{-1}}\frac{2}{1}\]
Answer» B. \[{{\sin }^{-1}}\frac{5}{4}\]


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