Correct Answer - Option 1 : 30°
Let the refraction angle be ‘r’
So, \({w^{{\mu _g}}} = \frac{{\sin i}}{{\sin r}}\)
\(\Rightarrow \frac{{{\mu _g}}}{{{\mu _w}}} = \frac{{\sin i}}{{\sin r}}\)
\(\Rightarrow \sin r = \sin 45^\circ \times \frac{{1.33}}{{1.88}}\)
\(= \frac{1}{{\sqrt 2 }} \times \frac{{1.33}}{{1.88}} = \frac{1}{2}\)
r = 30°