When unpolarized light is incident on the interface separating the rarer medium and the denser medium, Brewster angle is found to be . Determine the refractive index of the denser medium.
The Brewster angle is given ,
.
The Brewster law states that the tangent of the polarizing angle of incident of a transparent medium is equal to the refractive index of the medium.
Brewster's angle
,
Assuming the rarer medium as air.
Hence, the refractive index of the denser medium is .