The threshold of dark-adapted scotopic vision is 6, Ask an Expert

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Q. The threshold of dark-adapted (scotopic) vision is 6.0 multiplied by 10-11 W/m2 at a central wavelength of 550 nm. If light with this intensity and wavelength enters the eye when the pupil is open to its maximum diameter of 7.5 mm, how many photons per second enter the eye?

Q. How strong is the electric field between the plates of a 0.90 air-gap capacitor if they are 1.0 apart and each has a charge of 72 ?

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