The angle of polarisation for a medium with respect to air is $60^{\circ}$. The critical angle of this medium with respect to air is

  • A
    $\sin ^{-1} \sqrt{3}$
  • B
    $\tan ^{-1} \sqrt{3}$
  • C
    $\cos ^{-1} \sqrt{3}$
  • D
    $\sin ^{-1} \frac{1}{\sqrt{3}}$

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