Final answer:
Weber's law is relevant to understanding difference thresholds, as it states that the difference threshold is a constant fraction of the original stimulus.
Step-by-step explanation:
Weber's law is relevant to an understanding of difference thresholds. Unlike the absolute threshold, the difference threshold changes depending on the stimulus intensity. Weber's law states that the difference threshold is a constant fraction of the original stimulus. For example, imagine yourself in a dark movie theater. If a cell phone screen lights up, it would be easily noticeable because the change in illumination is significant. However, if the same thing happened in a brightly lit arena during a basketball game, very few people would notice because the change in illumination is not as significant relative to the overall brightness. This demonstrates Weber's law in action.