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  4. The refractive index of water is 1.33. The direction in which a man under water should look to see the setting sun is

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Q. The refractive index of water is $1.33$. The direction in which a man under water should look to see the setting sun is

ManipalManipal 2009Ray Optics and Optical Instruments

Solution:

$\sin \theta=\frac{1}{\mu_{w}} =\frac{1}{1.33}$
$\Rightarrow \theta=\sin ^{-1}\left(\frac{1}{1.33}\right)$
$=49^{\circ}$ to the vertical