When your headlights shine into fog, what happens to the light?

When headlights shine into fog, the light interacts with the water droplets present in the fog. The phenomenon that occurs is that the light is reflected back by those water particles. This reflection makes the fog appear denser and can significantly reduce visibility, as the light does not reach beyond the foggy area but rather bounces around within it, creating a glare that can make driving challenging.

In contrast, the other options fail to accurately describe what happens. While some light may be absorbed to a degree, the predominant impact is that the water particles reflect the light, leading to the aforementioned visibility issues. The light does not penetrate deeper effectively because of this reflection and diffusion caused by the fog. Overall, understanding how light behaves in fog conditions is crucial for safe driving practices.