Concave Convex lenses

How are concave and convex lenses different?
A convex lens is thicker in the middle compared to the edges. It is also called a converging lens because the rays and bent together. A convex lens is also called a positive lens because of the location of the focal point.
A concave lens is thinner in the middle compared to the edges.
It is called a diverging lens because the rays of light spread out.
A concave lens also is called a negative lens because the focal point is behind the lens.