Q. At what angle of incidence will the light reflected from glass $(mu = 1.5)$ be completely polarised

In This post you will get answer of Q.
At what angle of incidence will the light reflected from glass $(mu = 1.5)$ be completely polarised

Solution:

Using, $tan,i_p = mu= 1.5$

or $i_p = tan^{- 1} (1.5) = 56.3^{circ}$