Before revision: The Fresnel equation is given as follows : Surface roughness Figure1:Specular reflection of light from a rough surface Surface roughness in micrometer range influences the specular reflectance levels .
After revision: The Fresnel equation is given as follows : Surface roughness Figure1:Specular reflection of light from a rough surface Surface roughness ; in the visible frequencies, the surface finish in the micrometre range is most relevant influences the specular reflectance levels .