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Homework Help: Phyiscs human eye

  1. Mar 12, 2005 #1
    A human eyeball is about 2 cm long and the pupil has a maximum diameter of about 5 mm. What is the speed of this lens?

    f-stop = 2 cm / .5 cm

    f-stop = 4

    is this it?

    I'm not sure if I found the right formula in my book

  2. jcsd
  3. Mar 12, 2005 #2
    what is f-stop..??
    and dont you have to use SI units?
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