Final answer:
The correct action is to dim your headlights when approaching another vehicle at night to avoid impairing the other driver's vision. Though the question says '50 feet,' it's typically recommended to do so at least 500 feet for oncoming vehicles, and 300 feet when following another vehicle, depending on local regulations.
Step-by-step explanation:
The question refers to how you should use the headlights on your car when approaching another vehicle at night. It's important to dim your lights as you get closer to an oncoming car to avoid blinding the other driver. While the student's question specifies '50 feet,' the correct distance to dim your headlights can vary depending on where you are. In many places, the recommended distance is 500 feet when approaching an oncoming vehicle, and 300 feet when following another vehicle.
This is to ensure that you do not impair the other driver's vision, which could lead to dangerous driving conditions. On a related note, understanding light and distance is crucial for safety reasons. As you move further from a light source, the intensity of the light decreases rapidly — this is due to the inverse square law of illuminance, which states that the illuminance is inversely proportional to the square of the distance from the source.