The ICI, or Inverse Square Law of Light, states that the intensity of light decreases in proportion to the square of the distance from the source. In other words, as the distance from the light source increases, the intensity of the light decreases, and vice versa.
This occurs because light spreads out in all directions from its source, and the further away it gets, the more it spreads out. As a result, the amount of light that reaches a given point in space decreases as the distance from the source increases.
To illustrate this, imagine a flashlight shining on a target. The light radiates out from the flashlight in all directions, and the closer the target is to the flashlight, the more light it receives. However, as the target moves further away from the flashlight, the light has to spread out over a larger area, resulting in a decrease in intensity.
The ICI is a fundamental principle in physics and applies to all types of electromagnetic radiation, including light, sound, and even radio waves. It is an important concept to understand in various fields such as photography, lighting design, and telecommunications.