Fresnel Equation Reflectance S Polarized Light Formula

Equation for calculate fresnel equation reflectance s polarized light is,

R_p = ((n1 x cosθ_i - n2 x cosθ_t) / (n1 x cosθ_i + n2 x cosθ_t))²

Where,
R_p = Reflectance for S-Polarized Light
n1 = Refractive Index Of Medium1
n2 = Refractive Index Of Medium2
θ_i = Angle Of Incidence
θ_t = Angle Of Transmission