To use a convex lens as a magnifier, where must the object be placed?

1. To use a convex lens as a magnifier the object must be closer to the converging lens than its focal length. 2. In that arrangement the image is virtual, upright and larger than the object. 3. Pulling the lens away past the focal length makes the image blur and then invert, because the arrangement becomes the real image case. 4. The distance at which the image blurs, and beyond which it inverts, is the focal length of the lens. _Source: OpenStax College Physics (CC BY 4.0), Ch 25 "Geometric Optics", section 25.6 Image Formation by Lenses_