Where should an object be placed in order to use a convex lens as a magnifying glass?
In order to use a convex lens as a magnifying glass, the object should be placed at a distance less than $F'$ (focus) of the lens.
Explanation
When an object is placed at a distance less than the focus i.e., between optical centre, $C$ and focus, $F'$ of a convex lens, then the image formed is virtual, erect, larger than the object (enlarged or magnified), and behind the object (on the left side of the lens).
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