2020年7月7日 · A converging lens is an optical lens that converges all rays of light passing through it. The primary purpose of a converging lens is to focus the incoming rays from an object and converge them to form an image. The image can be magnified, diminished, or remain the same depending on the distance of the object from the lens.

(The axis is defined to be a line normal to the lens at its center, as shown in Figure 1.) Such a lens is called a converging (or convex) lens for the converging effect it has on light rays. An expanded view of the path of one ray through the lens is shown, to illustrate how the ray changes direction both as it enters and as it leaves the lens.