1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook