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Wave Optics

Question
CBSEENPH12038220

A small telescope has an objective lens of focal length 140 cm and an eyepiece of focal length 5.0 cm. What is the magnifying power of the telescope for viewing distant objects when the telescope is in normal adjustment (i.e., when the final image is at infinity)?

Solution
Given, the telescope is in normal adjustment. 
Focal length of the objective lens, f
0 = 140 cm
Focal length of the eyepiece,  f
e = 5 cm

Therefore,
Magnifying power, m = -28 

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