How far apart should the objective lens and the eyepiece lens be in a refracting telescope? (See Figure 3-19,Comins,Discovering the Essential Universe,6th ed.)
A) a distance equal to the focal length of the objective lens
B) a distance equal to the focal length of the eyepiece lens
C) a distance equal to the focal length of the objective lens minus the focal length of the eyepiece lens
D) a distance equal to the sum of the focal lengths of the two lenses

Question

Quizplus · Accepted Answer

In a refracting telescope, the objective lens and the eyepiece lens should be separated by a distance equal to the sum of their focal lengths to properly focus the image.

How Far Apart Should the Objective Lens and the Eyepiece