Assuming medium $1$ is air and given the incident angle is $30$ and the angle of refraction is $20,$ what is the index of refraction of medium $2?$

$1\mathrm{.}93$

$2\mathrm{.}40$

$1\mathrm{.}33$

$1\mathrm{.}00$

$1\mathrm{.}46$