It is a lens that is thinner at the edges and thicker in the middle. One side of a convex lens must be convex. This type of lens is used to converge parallel light or convert a point light source into parallel light. Convex lenses are used to magnify images, focus, and make telescopes, microscopes, presbyopic glasses, etc. Convex lenses have the function of converging light rays, so they are also called converging lenses. A thicker convex lens has functions such as telescoping and converging, which is related to the thickness of the lens.
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