How can you increase the magnification of a refracting telescope without decreasing the light-gathering power?
A) Decrease both the diameter and the focal length of the objective lens.
B) Increase the focal length of the eyepiece.
C) Decrease the focal length of the eyepiece.
D) Increase the diameter of the eyepiece.

Question

Quizplus · Accepted Answer

The magnification of a refracting telescope is given by the ratio of the focal length of the objective lens to the focal length of the eyepiece. Therefore, increasing the focal length of the eyepiece will increase the magnification without decreasing the light-gathering power.

How Can You Increase the Magnification of a Refracting Telescope