A refracting astronomical telescope has objective and eyepiece lenses of focal lengths 20.0 cm and 0.10 cm,respectively.What is the angular magnification of this instrument?
A)67
B)130
C)200
D)380

Question

Quizplus · Accepted Answer

The angular magnification of a refracting telescope can be calculated as the ratio of the focal length of the objective lens to the focal length of the eyepiece lens:
M = fo/fe
where M is the angular magnification, fo is the focal length of the objective lens, and fe is the focal length of the eyepiece lens.
Substituting the given values, we get:
M = 20.0 cm / 0.10 cm = 200
Therefore, the angular magnification of the telescope is 200, which is the closest to option C (200) among the given choices.

A Refracting Astronomical Telescope Has Objective and Eyepiece Lenses of Focal