Concept:A magnifying glass uses a convex lens to create an enlarged, upright virtual image of an object placed close to the lens.Explanation:A convex lens is thicker in the middle and thinner at the edges. It converges light rays toward a focal point. When the object is placed between the lens and its focal point, the lens produces a magnified virtual image that appears larger to the eye. This is why convex lenses are found in magnifying glasses, as well as in microscopes and camera lenses. In contrast, concave and plano‑concave lenses diverge light and do not magnify.Answer:B. Convex lens