Optics Question 412

Question: An astronomical telescope of ten-fold angular magnification has a length of 44 cm. The focal length of the objective is

[CBSE PMT 1997]

Options:

A) 4 cm

B) 40 cm

C) 44 cm

D) 440 cm

Show Answer

Answer:

Correct Answer: B

Solution:

$ L=f _{o}+f _{e}=44 $ and $ |m|\ =\frac{f _{o}}{f _{e}}=10 $ .

This gives $ f _{o}=40\ cm $



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