You are studying in a room lit by 25 watts of light. Your roommate yells at you to turn up the light, so you rotate the dimmer switch once and your roommate thanks you. Later that evening, the light is at 90 watts, and your roommate tells you to turn it up again. You again rotate the dimmer switch once, but your roommate can't tell that the light has increased. This best illustrates

Question

Quizplus · Accepted Answer

Weber's law states that the just noticeable difference between two stimuli is proportional to the magnitude of the stimuli. In this scenario, the increase in light intensity was not noticeable to the roommate because the relative change was too small compared to the initial intensity.

You Are Studying in a Room Lit by 25 Watts