Optics Question 405

Question: The focal lengths of the objective and eye lenses of a telescope are respectively 200 cm and 5 cm. The maximum magnifying power of the telescope will be

[MP PMT/PET 1998; JIPMER 2001, 02]

Options:

A) ? 40

B) ? 48

C) ? 60

D) ? 100

Show Answer

Answer:

Correct Answer: B

Solution:

Magnifying power of astronomical telescope $ m=-\frac{f _{o}}{f _{e}}( 1+\frac{f _{e}}{D} )=-\frac{200}{5}( 1+\frac{5}{25} )=-\ 48 $ .



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