Refractive indices of two media in contact are $\sqrt{3}$ and 1.5. A ray of light travelling in optically denser medium strikes  the interface at an angle of incidence equal to the critical angle of the pair of media. Then angle of deviation of the refracted ray is 

• A

  ${45}^o$

• B

  ${30}^o$

• C

  ${60}^o$

• D

  ${90}^o-{\sin }^{-1}\frac{1}{\sqrt{3}}$