Final answer:
When approaching other vehicles, driving in well-lit areas, in fog, or following another vehicle closely, always use dim or low beam headlights to avoid blinding other drivers. High beams should be reserved for poorly lit roads where no oncoming traffic is present.
Step-by-step explanation:
Always use dim lights when approaching other cars so as not to blind the driver. Also, use low beam when driving where there are street lights, in fog, and when following another car closely. The use of high beams or bright lights can cause significant glare for other drivers, which can lead to reduced visibility and potential accidents.
Car headlights are designed to provide a directional beam of light that illuminates the road without causing unnecessary glare. This is similar to the way a light bulb filament placed at the focal point of a convex lens in traffic lights emits a directional beam of light. When driving in conditions that impair visibility, it is crucial to use the correct headlight setting to ensure both your safety and the safety of others on the road.