Final answer:
The question approaches the topic of headlights visibility from a legal and safety regulation perspective, not covered by the physics examples. These examples focus on the optical resolution limit of the human eye using physics principles and the Rayleigh criterion.
Step-by-step explanation:
The question relates to the optical resolution limit of the human eye, specifically regarding how far apart two objects must be for the eye to distinguish them as separate. This is a physics problem involving diffraction and the resolving power of the eye, which is calculated based on the Rayleigh criterion.
From information provided in the example questions, the resolution limit of the eye is related to diffraction by the pupil, and one calculation gives a practical distance limit at which car headlights, 1.3 meters apart, can be resolved. Using physics principles, with assumptions about pupil size and light wavelength, you can derive the maximum distance under optimal conditions at which a human eye can resolve two points as distinct. However, this original question relates to how far away must your headlights be seen, which is a matter of law and driving safety regulations rather than optical physics.
Typically, regulations require that vehicle headlights must be visible from a distance to ensure safety. Without the specifics of regional laws, a general rule of thumb is that headlights should be visible at a minimum varying from 100 feet to several hundred feet, but this can differ depending on the jurisdiction. The exact legal requirement for the visibility range of headlights is not addressed within the context of physics problems provided.