At night the pupils of a certain womans eyes are 8 mm in diameter. (a) How many
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At night the pupils of a certain woman’s eyes are 8 mm in diameter.
(a) How many kilometers away from a car facing her will the woman be able to distinguish its headlights from each other?
(b) What would the distance be if her pupils were 4 mm in diameter (say at twilight)? Assume that the headlights are 1.5 m apart, that the average wavelength of their light is 600 nm, and that her eyes attain half their theoretical resolving power.
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