Determine how many photons per second enter the eye

Reference no: EM13539472

The human eye can barely detect a star whose intensity at the earth's surface is 1.6E-11W/m2. If the dark adapted eye has a pupil diameter of 6.3mm , how many photons per second enter the eye from the star? Assume the starlight has a wavelength of 550nm.

Reference no: EM13539472

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