In order for a telescope to produce a large magnification one would select lenses of
A) short focal length for the objective and long focal length for the eyepiece.
B) short focal length for both objective and eyepiece.
C) large focal length for both objective and eyepiece.
D) large focal length for the objective and short focal length for the eyepiece.

Question

Quizplus · Accepted Answer

To produce a large magnification, the focal length of the objective lens should be significantly larger than the focal length of the eyepiece. This is because magnification is directly proportional to the ratio of the focal lengths of the objective and eyepiece lenses. Therefore, we need a large focal length for the objective lens and a short focal length for the eyepiece lens to achieve a large magnification. Therefore, choice D is the best option.

In Order for a Telescope to Produce a Large Magnification