AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
The object must be placed between the focus F₁ and the optical centre O (i.e., within 20 cm from the lens). The image formed is virtual and erect, meaning light rays only appear to diverge from it and do not actually meet — hence it cannot be caught on a screen.
For a convex lens to act as a magnifier, the object must be within the focal length so the image is virtual, enlarged, and erect (Table 9.4). A virtual image is formed by the apparent intersection of diverging rays, not real convergence of light, so no screen can capture it. Examiners expect both the range (between F and O) and the reason (virtual image).