Fallinglight

Fallinglight is a visual phenomenon that describes the appearance of light rays, often observed in dusty or foggy environments when light enters at an angle. This effect is typically seen when sunlight streams through a window or gaps in clouds, illuminating particles suspended in the air. The visible streaks of light are not the light itself but rather the scattering of light by these airborne particles.

The scientific principle behind fallinglight is known as the Tyndall effect, which is the scattering of light as a light beam passes through a colloid. The individual particles in the air, such as dust, smoke, or water droplets, are large enough to scatter the light in all directions, making the path of the light beam visible. The angle of the light source relative to the observer is crucial; a low angle of incidence often enhances the visibility of fallinglight.

This phenomenon is a common subject in photography and art due to its aesthetic appeal. Artists often try to capture the dramatic effect of light filtering through natural or man-made structures. In atmospheric science, the observation of fallinglight can provide clues about the presence and density of aerosols and other particulate matter in the atmosphere. While the term "fallinglight" is descriptive, it is not a formal scientific term.