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  4. What should be the distance from the objective lens of an object to focus it properly so that the final image is formed at the least distance of clear vision?

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Q. What should be the distance from the objective lens of an object to focus it properly so that the final image is formed at the least distance of clear vision?

NTA AbhyasNTA Abhyas 2022

Solution:

For eyepiece, $V_{E}=-25cm,f_{E}=+5cm$
$\Rightarrow u_{E}=-4.17cm=-4.2cm$
$L=v_{0}+\left|u_{E}\right|=12.2cm$
here $v_{0}=8cm$
$f_{0}=+1cm\Rightarrow u_{0}=-1.1cm$