Unpolarised light is incident from air on a plane surface of a material of refractive index $\mu$. At a particular angle of incidence i, it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation?

• A

  Reflected light is polarised with its electric vector parallel to the plane of incidence

• B

  Reflected light is polarised with its electric vector perpendicular to the plane of incidence

• C

  $i={\sin }^{-1}\left(\frac{1}{\mu }\right)$

• D

  $i={\tan }^{-1}\left(\frac{1}{\mu }\right)$