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Calculate the light-gathering power of the 2.4 meter Hubble Space Telescope is compared to the human eye?

I am currently in an Astronomy 101 class and i am stuck on a question. The question is... Calculate how much greater the light-gathering power of the 2.4 meter Hubble Space Telescope is than the human eye with a diameter of 6 millimeters. I'm not really sure how to even begin to solve that question, thanks in advance for any help!
Answer:

Well first off you probably want to convert those numbers, so 6 millimeters equals .0006 meters OR 2.4 meters equals 2,400 millimeters. I guess you could compare the two in a ratio aspect by dividing the numbers? 1:400. So the Hubble Space Telescope would gather approximately 400 times more light then the human eye, I suppose.

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