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Answer :
Final answer:
You should use your headlights when visibility is less than 500 feet due to decreased light intensity with distance and poor visibility conditions.
Explanation:
When visibility is less than 500 feet, you should use your headlights. This situation occurs because as distance increases, the amount of light that reaches our eyes decreases significantly, making it harder to see objects like car headlights from afar. The deterioration in visibility is due to the fact that light spreads out as it travels, and the intensity of light follows an inverse square law, meaning if you stand twice as far from a light source, the area the light covers is four times greater, thus you receive four times less light.
Therefore, in poor visibility conditions, such as heavy fog or rain, using headlights becomes necessary to be seen by other drivers.
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