The inverse square law states that the intensity of the radiation is inversely proportional to the square of the distance from the source.

- Increasing the mA darkens the radiograph.
- Decreasing exposure time darkens the radiograph.
- Exposure time is difficult to change on most machines.
- Milliamperage affects radiographic contrast.

The Inverse Square Law in physics states that the intensity of light or sound from a point source decreases as the inverse of the square of the distance from the source, affecting light propagation similar to the effects of gravity.

Explanation:

The Inverse Square Law is a fundamental concept in physics that describes how the intensity of radiation, such as light or sound, from a point source diminishes with distance. As per this law, the intensity is inversely proportional to the square of the distance from the source. For instance, if you double the distance from a light source, the area over which the light spreads is quadrupled (22), resulting in a quarter of the original intensity falling on any given area. This principle is not limited to light; it applies to other forms of radiation, like the gravitational field and the electric field, which also follow this law. Therefore, moving three times further away from the source would decrease the intensity to one-ninth, whereas halving the distance would increase the intensity fourfold.