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: Optics: Telescopes

  1. Feb 26, 2005 #1
    I've been stuck on this problem for a while now, and have tried it several different ways, but with no results. This leads me to believe that I'm missing something obvious or simply approaching it from the wrong direction.

    The moon subtends an angle of 0.5 degrees at the objective lens of a terrestrial telescope. The focal lengths of the objective and ocular lenses are 20 cm and 5 cm, respectively. Find the diameter of the image of the moon viewed through the telescope at near point of 25 cm.

    Any help would be appreciated! Thanks!

  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted