The 200-in reflecting telescope at Mt.Palomar has an objective mirror with a focal length of 16.8 m.If you use an eyepiece with a focal length of 2.00 cm,what is the overall magnification of this telescope?
A)-250
B)-130
C)-840
D)-38
E)-300

Question

Quizplus · Accepted Answer

The overall magnification of a telescope is given by the ratio of the focal length of the objective lens (or mirror) to the focal length of the eyepiece. Thus, magnification = $ \frac{16.8\,m}{2.00\,cm} = \frac{16.8\,m}{0.02\,m} = 840 $. The negative sign indicates an inverted image, which is typical for astronomical telescopes, but the magnitude of the magnification is 840.

The 200-In Reflecting Telescope at Mt