Pascoe's Law states that the intensity of a physical phenomenon is inversely proportional to the square of the distance from the source. This means that as you move further away from the source of the phenomenon, its intensity decreases rapidly. For example, if you consider the brightness of a light bulb, the light becomes dimmer as you move away from it. This principle is important in various fields, including physics and engineering, as it helps in understanding how forces and energies dissipate over distance.