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物体在透镜前能成不同性质的像,这是人们早已解决了的问题。但物体在透镜前究竟能成多少像并不是人们都熟悉的。 1 凸透镜成像 1.1当物体处于凸透镜2倍焦距以外时,在凸透镜的另一侧将成倒立缩小的实像;物体处于凸透镜2倍焦距时,在凸透镜的另一侧将成倒立等大的实像;物体处于凸透镜2倍焦距和焦距之间时,在凸透镜的另一侧将成倒立放大的实像;物体处于凸透镜的焦点时不成像;物体处于凸透镜焦点以内时在
Objects can behave differently in front of the lens. This is a problem people have long solved. However, how much an object can be made in front of a lens is not something that people are familiar with. 1 Convex Lens Imaging 1.1 When an object is outside the convex lens at a focal length of 2x, it will be an inverted real image on the other side of the convex lens. When the object is at a focal length of 2x, it will be an inverted true image on the other side of the convex lens; the object is in the convex lens. When between 2x focal length and focal length, the other side of the convex lens will be an inverted real image; when the object is at the focal point of the convex lens, it will not be imaged; when the object is within the focal point of the convex lens,