How many photons per second are entering the pupil

Reference no: EM13303233

A. Estimate the number of photons per second emitted by a 70W light bulb, assuming a photon wavelength in the middle of the visible spectrum, 550nm.

B. A person can just see this bulb from a distance of 800m, with the pupil diameter dialated to 7.5mm, how many photons per second are entering the pupil?

Reference no: EM13303233

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