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  4. The graph shows how the magnification m produced by a thin lens varies with image distance v . The focal length of the lens used is <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-7vgufnfpok7l.png />

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Q. The graph shows how the magnification $m$ produced by a thin lens varies with image distance $v$ . The focal length of the lens used is



Question

NTA AbhyasNTA Abhyas 2020Ray Optics and Optical Instruments

Solution:

For a thin lens,
$\left|m\right|=\left|1 - \frac{v}{f}\right|$
From the graph, slope of the line $m=\frac{1}{f}$
$\frac{c}{b}=\frac{1}{f}$
$f=\frac{b}{c}$