First, the telescope can see Qingyuan because the convex lens with large diameter and long focal length in front of the telescope is called the objective lens; A lens with a small diameter at the back and a short focal length is called an eyepiece. The objective lens condenses the light from the distant scene behind into an inverted reduced real image, which is equivalent to moving the distant scene to the imaging place at once. The inverted image of this scene falls right in the front focus of the eyepiece, so looking at the eyepiece is like looking at something with a magnifying glass, and you can see a virtual image magnified many times. In this way, in the downloaded telescope, the distant scenery looks as if it is close at hand. Like other optical instruments, after a long history of development, telescopes of various structures have come out one after another. According to the optical principle, it can be divided into refraction and reflection.
Second, who invented the telescope, commonly known as prism binoculars, because of its short lens barrel, wide field of vision and easy to carry, it is often used in military and field investigations. Reflective telescope with concave mirror as the objective lens and convex lens as the eyepiece is used to observe celestial bodies in the Observatory. The first person to get a patent for the telescope was hensley Percy, a Dutch optical instrument manufacturer, who applied for a patent at 1608. According to the Lipper telescope, Italian scientist Galileo made one himself in 1609. 00-300 was improved in design and was soon used to study planets and stars.
As long as there are infinite objects, a telescope can see infinity. Hundreds of light years away from the planet, you can see it without a telescope, and you can see it with a telescope. The moon is far away from us (380,000 kilometers), but we can see it through a telescope.