A diverging lens is another name for concave lenses.
The refraction of light beams as they pass through the lens is necessary for the lens to function.
A concave lens behaves like a diverging lens when light entering the lens diverges. After passing through the lens, the light beam curves away from the center axis.
Concave lenses have larger borders and thinner centers.
All light rays entering the lens parallel to the axis appear to come from the same location, which is called the focus, thanks to the lens's design.
In telescopes and binoculars, concave lenses are used to magnify pictures.