Final answer:
Quality of illumination pertains to the distribution of brightness in the visual environment.
Step-by-step explanation:
Quality of illumination pertains to the distribution of brightness in the visual environment. It refers to how the light is spread across different surfaces and areas, affecting the overall lighting conditions. For example, if the light is evenly distributed and there are no areas that are significantly brighter or darker than others, we would say that the quality of illumination is good.