An Astronomical Telescope Has an Objective Lens with Focal Length

Multiple Choice

An astronomical telescope has an objective lens with focal length f_o and has an eyepiece with focal length f_e.A second telescope has objective and eyepiece lenses with triple the focal length of the first telescope.Which telescope gives the greater magnification and by what factor?

A) The first telescope gives 9 times the magnification of the second.
B) The second telescope gives 9 times the magnification of the first.
C) Both telescopes give the same magnification.
D) The actual focal lengths must be known to answer this question.