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 $ .
