At what position of the object does a convex lens act as a magnifying glass?

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Between f and 2f

Between f and O

Beyond f

Beyond 2f

answer is B.

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Detailed Solution

When the object is placed between f and O, a convex lens acts as a magnifying glass.
A convex lens acts as a magnifying glass when it forms an object's virtual, erect, and magnified image. The object is placed between the optical centre and the principal focus for the magnified image. In a convex lens, parallel light passes through it and converges at focus, so if they are between f and O, it will work as a magnifying glass.
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