AIPMT PRELIMS2012Physics-Optics
AIPMT PRELIMS 2012 Physics Telescopes MCQ Question
Type: MCQ-numerical-Medium-Class 12
The magnifying power of a telescope is 9. When it is adjusted for parallel rays the distance between the objective and eyepiece is 20 cm. The focal length of lenses are
A
11 cm, 9 cm
B
10 cm, 10 cm
C
15 cm, 5 cm
D
18 cm, 2 cm
Correct Answer
Option D
Detailed Explanation
Using the formula for magnifying power, M = f₀/fₑ = 9, and the total length f₀ + fₑ = 20 cm, solving gives f₀ = 18 cm and fₑ = 2 cm.
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