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Magnifying glass is enlarged from two convex lens. Firstly, several concepts are explained: convex lens has a convergence effect on light, and light parallel to the main optical axis will converge into a point through convex lens. This is the focus of convex lens. The distance between the focus and the center of light (the center of convex lens) is the focal length. When the object is within convex lens focal length, it presents a positive enlarged virtual image. When the object is between the focal length of Convex Lens 1 bixdo 2 times, it presents an inverted enlarged real image. When the object is outside the focal length of convex lens 2 times, it presents an inverted and reduced real image. Magnifying glass principle: when we use a magnifying glass, we put the object within the focal length. At this time, we can see the virtual image of the object enlarged through convex lens, and the farther the magnifying glass is from the object, the larger the virtual image (within 1 focal length) microscope principle: the microscope consists of two convex lens pieces, placing the object between 1 bixdo and 2 times focal length of the objective lens, this is a real image of an object being inverted and enlarged. Then make the real image appear within 1 times of the focal length of the eyepiece, then the enlarged real image continues to present a vertical enlarged virtual image. At this time, what enters the human eye is to enlarge the virtual image twice. Greatly increase the magnification of objects. Magnifying glass magnifier is a simple visual optical device used to observe the details of objects. It is a focal length-specific eye The converging lens with a much smaller distance of photopic vision. The image size of an object on the retina of the human eye is proportional to the angle (perspective) of the object to the eye. The larger the perspective, the larger the image, the more the details of the object can be distinguished. Moving closer to the object can increase the viewing angle, but it is limited by the focusing ability of the eye. Use a magnifying glass to make it close to the eyes and put the object within its focus to form a positive illusion. The function of magnifying glass is to enlarge the viewing angle.