Optics Question 439
Question: A Galileo telescope has an objective of focal length 100 cm and magnifying power 50. The distance between the two lenses in normal adjustment will be
[BCECE 2005]
Options:
A) 98 cm
B) 100 cm
C) 150 cm
D) 200 cm
Show Answer
Answer:
Correct Answer: A
Solution:
$ m=\frac{f _{o}}{f _{e}} $
Therefore $ \frac{100}{f _{e}}=50 $
Therefore $ f _{e}=2cm $
Normal distance $ f _{o}-f _{e}=100-2=98cm. $
