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  4. A convex lens of focal length 10 cm and image formed by it, is at least distance of distinct vision then the magnifying power is

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Q. A convex lens of focal length $10 \, cm$ and image formed by it, is at least distance of distinct vision then the magnifying power is

NTA AbhyasNTA Abhyas 2022

Solution:

The coverging lens used for magnification is called simple microscope or a magnifier.
When image is formed at $D$ , the least distance of distinct vision, then magnifying power
$M=1+\frac{D}{f}$
Given, $D \, $ = 25 cm, $f$ = 10 cm
$\therefore M=1+\frac{25}{10}=1+2.5=3.5$