An unpolarized light is incident on a plate of refractive index  $\sqrt{3}$ and the reflected light is found to be completely plane polarized. The angle of incidence and refraction are respectively

• A

  ${60}^0, {30}^0$

• B

  ${30}^0, {60}^0$

• C

  ${\sin }^{-1}\left(\frac{1}{\sqrt{3}}\right),{45}^0$

• D

  ${\tan }^{-1}\left(\frac{\sqrt{3}}{2}\right),{30}^0$