What is Reflectance?Reflectance DefinitionReflectance is defined as the ratio of the radiant flux reflected from a surface to the incident radiant flux, and it is unitless.Types of Reflectance Specular (mirror-like) Diffuse (scattering)Reflectivity DefinitionReflectivity is the property of a material to reflect light or radiation and remains consistent regardless of the material’s thickness.Reflectance MeasurementReflectance can be measured relatively using a reference plate or absolutely by co