👉 Non-luster is a concept in electronics and optical communication, which refers to an object that has a low level of light or other electromagnetic radiation. It can be defined as something that does not emit any visible light at all. In other words, it is a material with very little or no reflectivity. The nonluster effect is often seen in materials with high refractive index and low optical absorption. Examples include metals like copper and gold, which have very little reflection off of visible light.
