**Question:** The threshold of dark-adapted (scotopic) vision is \(4.5 \times 10^{-11}\ \text{W/m}^2\) 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?**Answer Box:** [ ](Note: The red "X" suggests a previous incorrect attempt at the answer, but no further information on the solution process is provided.)

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The threshold of dark-adapted (scotopic) vision is 4.5 x 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? x