The focal length of the objective lens of a telescope is 75.0 cm,and the eyepiece has a focal length of 6.00 cm.What is the magnification of this telescope?
A)0.0800
B)0.645
C)450
D)12.5
E)200

Question

Quizplus · Accepted Answer

Magnification of a telescope can be calculated using the formula: 
magnification = (-)f_objective / f_eyepiece
where f_objective is the focal length of the objective lens and f_eyepiece is the focal length of the eyepiece.
Substituting the given values, we get:
magnification = (-)75 cm / 6.00 cm = -12.5
The negative sign indicates that the image is inverted. Therefore, the magnification of the telescope is 12.5.

The Focal Length of the Objective Lens of a Telescope