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NCERT Class XII Chapter
Ray Optics and Optical Instruments
Questions With Solutions

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Question : 13
Total: 38
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?
Solution:  
Given, f0 = 144 cm, fe = 6 cm, m = ?, L = ?
Magnifying power =
f0
fe
 =
144
6
 = 24
Separation between objective and eyepiece
(L) = f0+fe = 144 + 6 = 150 cm.
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