Flash Before Your Eyes

There are 125 million rod cells in one human eye. Each rod cell is sensitive enough to respond to one photon of power P. Knowing that surface area of the retina is 0.00125 m2, and that it takes 20% of the rod cells to become simultaneously active to exhibit a flash of blindness, what is the intensity of light required to blind both eyes?

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Photo attributed to ScientificRelevance.

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