Class 12 NEET Physics Optics Questions Part 1

Length of astronomical telescope (fo+fe)=44 cm and ratio of focal length of the objective lens to that of the eye piece

fo

fe

=10
From the given ratio, we find that fo=10fe.
Therefore 10fe+fe=44 or fe=4 cm
and focal length of the objective (fo)
=44−fe=44−4=40 cm