A small telescope has an objective lens of focal length 144 cm and an eyepiece of focal length 6.0 cm. What is the magnifying power of the telescope? What is the separation between the objective and the eyepiece?

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A Galilean telescope has an objective of focal length 200 cm and magnifying power 100. What is the distance between the two lenses in normal?

The correct option is D 198 cmfo=200cm,m=100m=fofe100=200fefe=2cmL=distance between two lensese=f0−fe=200−2=198cm

A Galilean telescope has an objective of focal length $200 c m$ and magnifying power $100$ . What is the distance between the two lenses in normal?

The correct option is D $198 c m$
$f_{o} = 200 c m, m = 100$
$m = \frac{f_{o}}{f_{e}}$
$100 = \frac{200}{f_{e}}$
$f_{e} = 2 c m$
$L = d i s t a n c e b e t w e e n t w o l e n s e s e = f_{0} - f_{e} = 200 - 2 = 198 c m$