Unpolarised light is incident from air on plane surface of a material of refractive index $\mu$. At a particular angle of incident $i$ 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

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

  Reflected light is polarized with its electric vector perpendicular to the plane of incidence
• C

  Reflected light is polarized with its electric vector parallel to the plane of incident
• D

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

Solution

when reflected light rays and reflected rays are perpendicular, reflected light is polarised with electric field vector perpendicular to the plane of incidence.
Also. Brewster's law $\mu =\tan i$.

Hence, the correct answer is option: 'B'.