A telescope in which the objective lens is a converging lens and the eyepiece is a diverging lens. The real image formed by the refraction of the light through the objective lens is at the focal point behind the eyepiece (near the back of the human objective). This image is a virtual image to the eyepiece, so it becomes a magnified upright virtual image after being refracted. The magnification of the Galileo telescope is equal to the ratio of the focal length of the objective lens to the focal length of the eyepiece. Its advantage is that the lens barrel is short and can be upright, but its field of view is relatively small. A device in which two Galileo telescopes with low magnification are placed side by side and a bolt button can be used to adjust their clarity at the same time is called a "drama-watching mirror"; it is often used to watch performances because of its convenience to carry. The telescope invented by Galileo occupies an important position in the history of human understanding of nature. It consists of a concave lens (eyepiece) and a convex lens (objective). The advantage is that the structure is simple, and it can be directly formed into an upright image.
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