$4$ Brewster's Angle

Light propagating within a medium strikes a flat surface with another medium with incident angle $\backslash (\backslash$theta$=45^\{\backslash$circ$\}\backslash ).$ The light is partially reflected, resulting in ray $\backslash (\backslash$# $1\backslash ).$ It is then partially transmitted into the second medium, where it later strikes a third medium. The planes separating the media are parallel. The light is then at least partially reflected back $($you don't know how much, if any, is transmitted into the third medium$).$ The reflected light reflected then gets back into the original medium and emerges, resulting in ray $\backslash (\backslash$# $2\backslash ).$ The incident angle $\backslash (\backslash$theta $\backslash )$ is now slowly rotated from $\backslash (45^\{\backslash$circ$\}\backslash )$ to $\backslash (0^\{\backslash$circ$\}\backslash ),$ and it is noted that during this process ray $\backslash (\backslash$# $1\backslash )$ is first totally horizontally polarized, then ray $\backslash (\backslash$# $2\backslash )$ is totally horizontally polarized later. How should the refractive indexes of the media $\backslash ($ n$\_\{1\},$ n$\_\{2\}\backslash )$ and, $\backslash ($ n$\_\{3\}\backslash )$ compare with each other?