You stand on a straight desert road at night and observe a vehicle approaching. this vehicle is equipped with two small headlights that are 0.641 m apart. at what distance, in kilometers, are you marginally able to discern that there are two headlights rather than a single light source? take the wavelength of the light to be 549 nm and your pupil diameter to be 4.89 mm.

Explanation:

x' = 2 * 1.22 * lambda * ( f / D )

lambda = wavelength of light in mm

f = focal length in mm

D = aperture diameter in mm

sinβ=light separation/ distance eye

distance eye=light /sinβ

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newton's first law of motion