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  4. If the focal length of objective and eye lens are 1.2cm and 3cm respectively and the object is placed 1.25cm away from the objective lens and the final image is formed at infinity. what is the magnifying power of the microscope:

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Q. If the focal length of objective and eye lens are $1.2cm$ and $3cm$ respectively and the object is placed $1.25cm$ away from the objective lens and the final image is formed at infinity. what is the magnifying power of the microscope:

NTA AbhyasNTA Abhyas 2020

Solution:

$m_{\infty }=\frac{V_{0}}{u_{0}}\times \frac{D}{f_{e}}$
From $\frac{1}{f_{0}}=\frac{1}{V_{0}}-\frac{1}{u_{0}}$
$\Rightarrow \frac{1}{\left(\right. + 1 . 2 \left.\right)}=\frac{1}{v_{0}}-\frac{1}{\left(\right. - 1 . 25 \left.\right)}\Rightarrow v_{0}=30cm$
$\therefore \left|m_{x}\right|=\frac{30}{1 . 25}\times \frac{25}{3}=200$