Question

The angle of incidence at which reflected light is totally polarised for reflection from air to glass (refractive index n) is

• A. ${sin}^{-1}\left(n\right)$
• B. ${sin}^{-1}\left(\frac{1}{n}\right)$
• C. ${tan}^{-1}\left(\frac{1}{n}\right)$
• D. ${tan}^{-1}\left(n\right)$

Answer 1

The correct option is D ${tan}^{-1}\left(n\right)$

As per Brewster's law
$\tan i_p=n$

where $i_p$ is the angle of incidence when the reflected light is totally polarised.
$⟹i_p={tan}^{-1}\left(n\right)$