A telescope has an objective lens with a focal length of 90 cm and an eyepiece of focal length 3.0 cm.What is the angular magnification of the telescope?
A) 180
B) 33
C) 60
D) 30

Question

Quizplus · Accepted Answer

The angular magnification of a telescope is given by the formula:

M = (-) fo / fe

where fo is the focal length of the objective lens and fe is the focal length of the eyepiece.

Substituting the values given, we get:

M = (-)90 cm / 3.0 cm

M = (-)30

The negative sign indicates that the image formed by the eyepiece is inverted compared to the object. Therefore, the angular magnification of the telescope is 30.

So, the best choice is D.

A Telescope Has an Objective Lens with a Focal Length