Question

Distance from which class A and C lighting should be visible at night?

1) 100 meters
2) 200 meters
3) 300 meters
4) 400 meters

Answer 1

The maximum distance at which the human eye can resolve two headlights that are 1.3 meters apart is approximately 408.6 meters.

Step-by-step explanation:

The maximum distance at which the human eye can resolve two headlights that are 1.3 meters apart is determined by diffraction of light entering the eye. The practical limit for the eye's resolution is related to the angle between two just-resolvable points of light. For a pupil diameter of 0.40 cm and an average wavelength of 550 nm, the angle between two just-resolvable points is calculated using the formula:

angle = (1.22 * wavelength) / (pupil diameter)

To find the maximum distance at which the eye can resolve the two headlights, given that they are 1.3 meters apart, we can use the formula:

distance = (headlight separation) / tan(angle)

Substituting the values, we get the distance to be approximately 408.6 meters.