A telescope has an objective lens with a focal length of 200 cm and an eyepiece of focal length 3.0 cm.What is the angular magnification of the telescope?
A)15
B)67
C)75
D)230

Question

Quizplus · Accepted Answer

Angular magnification of the telescope can be calculated using 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 in the above formula, we get:

M = -200/3 = -66.67

Since the angular magnification of a telescope is always a positive quantity, we take the absolute value of M, which is:

|M| = 66.67 ≈ 67 (rounded to nearest integer)

Hence, the angular magnification of the telescope is approximately 67. Therefore, the best choice is B.

A Telescope Has an Objective Lens with a Focal Length