How many photons per second enter the eye from the star

Reference no: EM13519756

The human eye can barely detect a star whose intensity at the earth's surface is 1.6*10^-11.

If the dark adapted eye has a pupil diameter of 6.3 mm , how many photons per second enter the eye from the star? Assume the starlight has a wavelength of 550 nm.

Reference no: EM13519756

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