At What Distance Could One Theoretically Distinguish Two Automobile Headlights

Multiple Choice

At what distance could one theoretically distinguish two automobile headlights separated by 1.5 meters? Assume a pupil diameter of 0.50 cm and yellow headlights seen at the wavelength 5.0 × 10−⁷ m. Assume eye fluid has an average n = 1.33.

A) 6.0 km
B) 12 km
C) 9.0 km
D) 3.0 km
E) 16 km