A telescope has an objective lens with a focal length of 100 cm and an eyepiece of focal length 3.0 cm.What is the angular magnification of the telescope?
A)30
B)33
C)75
D)140
E)103

Question

A telescope has an objective lens with a focal length of 100 cm and an eyepiece of focal length 3.0 cm.What is the angular magnification of the telescope?
A)30
B)33
C)75
D)140
E)​103

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 given values, we get:
M = -100/3.0
M = -33.3

Since magnification cannot be negative, we take the absolute value:
M = 33.3

Therefore, the angular magnification of the telescope is approximately 33.

A Telescope Has an Objective Lens with a Focal Length