The threshold of dark-adapted scotopic vision is 40


The threshold of dark-adapted (scotopic) vision is 4.0 multiplied by 10-11 W/m2 at a central wavelength of 500 nm. If light with this intensity and wavelength enters the eye when the pupil is open to its maximum diameter of 9.0 mm, how many photons per second enter the eye?

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Physics: The threshold of dark-adapted scotopic vision is 40
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