WAEC Physics 2012 Objective — Question 31

Question 31 of 50 from the West African Examinations Council (WAEC) Physics 2012 Objective paper, with the correct answer and a full explanation.

The focal length of the eye-piece of an astronomical telescope is f1, while the focal length of the object is f2. For normal adjustment, the angular magnification is given by

A. A. f2/f1
B. B. 1-f2/f1
C. C. f2/f1-1
D. D. f1/f2Correct

Explanation

For normal adjustment of an astronomical telescope, angular magnification m = f0/fe = f1/f2 (objective focal length over eyepiece focal length).

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