It is found that at a laser bounced off the surface of a liquefied gas is completely polarized when the angle of incidence of the laser beam is $45\mathrm{.}70$ degrees from the vertical. What is the index of refraction of this material?

Multiple Choice

$1\mathrm{.}43$

$1\mathrm{.}397$

$1\mathrm{.}412$

$1\mathrm{.}091$