When Unpolarized Light from Air (With Refractive Index $1.00$ ) Strikes a Piece of Glass with Index of Refraction

Short Answer

When unpolarized light from air (with refractive index $1.00$ ) strikes a piece of glass with index of refraction $1.80$ , the reflected light is found to be completely polarized when the angle of incidence is equal to Brewster's angle. What is the anale of refraction in this case?