In transmission, the light falling on a body passes through depending on the transmittance au of this body. The degree of scattering of the transmitted light plays a role. With perfectly transparent materials such as clear glass there is no scattering whatsoever. The light continues to penetrate the material in a directed manner. As the scattering power increases, the directional component of the transmitted light becomes increasingly smaller until, in the case of complete scattering, only diffuse light is emitted. When transmitted through frosted glass, directional light becomes diffuse. The light scatters many times due to multiple reflection and a uniform distribution of brightness is achieved.