Find how many photons enter the pupil in one millisecond

Reference no: EM13668572

The threshold of dark-adapted (scotopic) vision is 40 pWm^-2 at a central wavelength of 500 nanometer. (Note: 1pW is 1 x 10^-12 W.) If light of this intensity and wavelength falls perpendicularly on an eye with the pupil open to its maximum diameter of 8 millimeter, find how many photons enter the pupil in one millisecond?

Reference no: EM13668572

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