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!

Galilean Teliscope

  1. May 18, 2012 #1
    I need to diagram a galilean teliscope for a project at school using a ray diagram. I know how to do the ray diagram for the first convex lens, but how does it work with the second concave lens. It always makes the image smaller for me. Does anyone know how to do this? Pictures would be great!
     
  2. jcsd
  3. May 18, 2012 #2

    HallsofIvy

    User Avatar
    Staff Emeritus
    Science Advisor

    The image from the first (objective) lens is always closer to the eyepiece (secondary lens) than its focal length. Drawing the ray diagram that way should show that it enlarges.
     
  4. May 18, 2012 #3
    That works when you use two convex (converging) lenses, but I am using a convex lens for the objective and concave (diverging) for the eyepiece.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook