Final answer:
The question asks about the human eye's ability to distinguish two points of light (car headlights) at a distance, using the concept of light diffraction and resolution.
Step-by-step explanation:
The question pertains to the resolution of the human eye and its ability to distinguish between two separate sources of light, such as the headlights of a car. Using the given pupil diameter and the distance between the headlights, one can derive the maximum distance at which the headlights can be resolved based on the diffraction limit of the human eye. This involves understanding concepts from optics, particularly regarding light diffraction and resolution. The practical limit for resolving two points as separate can be calculated using the Rayleigh criterion which considers the wavelength of the light and the diameter of the diffraction aperture (in this case, the pupil).