Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Focal point and telescopes

  1. Feb 5, 2008 #1
    so i am building a refractor telescope and i dont know what size to make the tube and what material to use for it?
    please telll me this is a huge % on my grade
     
  2. jcsd
  3. Feb 5, 2008 #2

    russ_watters

    User Avatar

    Staff: Mentor

    You need to start by selecting the lens. It determines the size of the tube.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook