Double-Convex Lense is the lens in which both the surface of the lens is convex, it is also called a biconvex lens. Double-Convex Lenses are used in image relay applications, or for imaging objects at close conjugates.
double convex lens
double convex lens
Some of the learners also asked: What are the characteristics of images formed by converging lens when the object is placed far off distance from the lens?