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  4. The magnification of an image by a convex lens is positive only when the object is placed

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Q. The magnification of an image by a convex lens is positive only when the object is placed

NTA AbhyasNTA Abhyas 2022

Solution:

The magnification of an image by the convex lens is positive only when the object is placed between focal point $\left(F\right)$ and optical centre because image formed by the convex lens for this location of the object is virtual and magnified and for real image $m=-ve$
For virtual image, $m=+ve$