The magnification of a handheld magnifying glass varies depending on the model and brand, but generally it can provide a magnification effect of several to several tens of times. This allows users to observe the details of objects more clearly, such as the antennae of insects and the cellular structure of plants. Meanwhile, the handheld magnifying glass also has a wide field of view, allowing users to maintain a comfortable viewing angle while observing.

Magnifying glasses have a wide range of applications in daily life and scientific research. In the field of education, teachers often use magnifying glasses to showcase the wonders of the microscopic world, such as biological and mineral samples, in order to stimulate students' interest and curiosity in learning. In scientific research, a magnifying glass is also one of the important tools, which can help scientists observe and analyze microstructures, and reveal the mysteries of nature.

The working principle of a magnifying glass is based on the focusing effect of a convex lens. When light passes through a convex lens, due to the different curvatures on both sides of the lens, the light refracts inside the lens, causing the light to converge towards the central axis of the lens. When we place an object within the focal length of a magnifying glass, the light emitted by the object refracts through the lens, forming a magnified virtual image on the other side of the lens. The size of this virtual image depends on the focal length of the magnifying glass and the distance from the object to the lens.

As an important teaching tool, magnifying glasses play an important role in education and scientific research. Through a magnifying glass, students can intuitively observe various microscopic phenomena and details, thereby stimulating their interest and curiosity in science. Meanwhile, magnifying glasses also provide scientists with a tool to observe and study the microscopic world, helping them reveal many unknown mysteries in nature.

Long term use of magnifying glasses under strong light may cause damage to the eyes. Therefore, when using, it is important to avoid direct sunlight or other strong light sources on the eyes. A magnifying glass is a precision optical instrument that needs to be properly stored to avoid damage or loss. Avoid adverse factors such as moisture, heat, or pressure during storage.