A Telescope Is Set Up in an Introductory Physics Lab

Multiple Choice

A telescope is set up in an introductory physics lab using lenses of focal lengths 10 cm and 50 cm. Since both lenses are the same diameter, it is not immediately clear which one to use as the eyepiece and which to use as the objective. If one uses the lens with a 50 cm focal length as the eyepiece, what power results?

A) 500
B) 5
C) 0.2
D) 0.002
E) one cannot look through the system in this direction