Q 9.28 A small telescope has an objective lens of focal length 140cm and an eyepiece of focal length 5.0cm. What is the magnifying power of the telescope for viewing distant objects when
(a) the telescope is in normal adjustment (i.e., when the final image is at infinity)?
Given,
the focal length of the objective lens
the focal length of the eyepiece lens
normally, least distance of vision = 25cm
Now,
As we know magnifying power:
Hence magnifying power is 28.