Newtons original reflecting telescope had a primary mirror of 33mm in diameter. If a human eye has a diameter?

of 8mm, how many photons per second could newton detect with the telescope compared to without? Assume 100% reflectivity of the mirror and that he just used one eye. I squared 33 and 8 and subtracted them from each other. The choices are 8, 17, 33, 38, 1089. I believe it is 1089. Any confirmation?

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