Optics Question 426

Question: An astronomical telescope has a magnifying power 10. The focal length of eyepiece is 20 cm. The focal length of objective is

[MP PMT 2002, 03; Pb. PET 2004]

Options:

A) 2 cm

B) 200 cm

C) $ \frac{1}{2}cm $

D) $ \frac{1}{200}cm $

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Answer:

Correct Answer: B

Solution:

$ m=\frac{f _{o}}{f _{e}}\Rightarrow 10=\frac{f _{o}}{20}\Rightarrow f _{o}=200\ cm $



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