alleryAn astronomical telescope in normal adjustment has an objective of focal length 100 cm and an eyepiece of focal length 5 cm. Its angular magnification is
A100
B5
C20
D500
Answer & Solution
Correct answer: C. 20
1. Normal adjustment: image at infinity, m = f_o / f_e.
2. m = 100 / 5 = 20.
3. (D) confuses m with f_o × f_e.
_Source: syllabus Physics Part II, Ch 9 §9.7.2_
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