Final answer:
The line of sight is the imaginary line that extends from a driver's eye to a point of focus.
Step-by-step explanation:
The imaginary line that extends from a driver's eye to a point of focus is called the line of sight. It is the line along which light rays from an object pass through the lens of the eye and converge to form an image on the retina. The line of sight helps us perceive the world around us and allows us to focus on specific objects or points of interest.