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Zandria
Zandria asked in Science & MathematicsAstronomy & Space · 1 decade ago

How does the light-gathering power of a 3.5 m telescope compare with that of the human eye? (Hint: Assume that?

full question: How does the light-gathering power of a 3.5 m telescope compare with that of the human eye? (Hint: Assume that the pupil of your eye can open to about 0.8 cm.)

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  • David Bowman
    Lv 7
    1 decade ago
    Favorite Answer

    the 3.5m telescope picks up 191406 times as much light as a .8cm pupil.

    area = pi times radius squared

    area (telescope)= 3.14 * 175cm * 175cm = 96162 square cm.

    area (pupil) = 3.14 * .4cm * .4cm = .5 square cm

    .5 goes into 96162 (divide by .5) 191406 times

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