A diver at a depth of 12m in water ($\mathrm{\mu } = \frac{4}{3}$) sees the sky in a cone of semi-vertical angle

• A

  ${\sin }^{-1}\left(\frac{4}{3}\right)$

• B

  ${\tan }^{-1}\left(\frac{4}{3}\right)$

• C

  ${\sin }^{-1}\left(\frac{3}{4}\right)$

• D

  90°