For a medium whose critical angle is 45⁰, the angle of polarisation is

• A

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

• B

  ${\tan }^{-1}\left(2\right)$

• C

  ${\tan }^{-1}\left(\sqrt{2}\right)$

• D

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