Imagine that you are in a vehicle at night on a long straight road. There are no streetlights and one vehicle up ahead in the distance.
Estimate how far away the other vehicle would be for its tail-lights to appear as a single
In your answer, make quantitative estimates to characterise:
• the colour of the light emanating from the tail-lights
• the spatial separation of the tail-lights
• the size of the pupil of your dark-adapted eye.
The Attempt at a Solution
red light has lambda = 700nm (700*10^-9m) but now i am not sure what to do. I need to equate/use lambda, lense of an eye and focal length/distance to car.