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  4. The length of a telescope, for which it is known that it has an objective lens of focal length 144 cm and an eye piece of focal length 6 cm , is

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Q. The length of a telescope, for which it is known that it has an objective lens of focal length $144 \, cm$ and an eye piece of focal length $6 \, cm$ , is

NTA AbhyasNTA Abhyas 2020Ray Optics and Optical Instruments

Solution:

The length of a telescope is
$l=f_{0}+f_{e}$
Given,
$f_{0}=144 \, cm=1.44 \, m,f_{e}=6.0cm=0.06 \, m$
$l=1.44+0.06=1.5m$