The objective of a telescope is of 20cm and
eye piece of 5.0cm focal length. What
magnifying power and length of telescope
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Answer:
Focal length of the objective lens, f
o
=140cm
Focal length of the eyepiece, f
e
=5cm
Least distance of distinct vision, d=25cm
When the telescope is in normal adjustment, its magnifying power is given as-
m=f
o
/f
e
=28
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