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Light can be detected when as few as 100 photons enter the eye in an interval...

Light can be detected when as few as 100 photons enter the eye in an interval of 1.00 x 10^-3 s. (only about 5 of these photons are absorbed by receptors in the retina.) What is the maximum distance at which you could possibly see a 100 W sodium lamp emitting light of wavelength 589 nm if your pupil is dilated to a diameter of 6.0 mm?

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