If I want to model a perfect reflecting material, what material parameters should I use? Specifically what refractive index or dielectric constant should I use?
I know from the Fresnel equations that a purely complex refractive index reflects 100% of the power, but in general it also adds a phase shift. What material parameters can give a reflection coefficient of exactly -1?
To the best of my knowledge an infinitely high refractive index of the reflecting medium can give the result I want, is there another way? I feel like I might be missing something simple.