Handheld magnifying glasses have a wide range of applications in daily life and scientific research. During outdoor exploration and travel, users can use handheld magnifying glasses to observe insects, plants, and other creatures, and experience the wonders of nature. In museums and art exhibitions, visitors can use handheld magnifying glasses to carefully observe the details of cultural relics and artworks, better understanding the historical and cultural value of the exhibits. In addition, handheld magnifying glasses are widely used in jewelry appraisal, philatelic, photography and other fields.

Magnifier, also known as convex lens, its amplification function is based on the principle of light refraction. When light passes through a convex lens from air, refraction occurs, causing the light to focus towards the center of the convex lens. Therefore, when we place an object within the focal length of the magnifying glass, the light emitted by the object is refracted by the convex lens, forming a magnified virtual image on the other side of the magnifying glass. This is the basic principle that magnifying glasses can magnify objects.