the Major Difference Between Concave And Convex Lenses is that in the convex or converging lens, after refraction, light rays meet at one point or appear to meet while in the concave or diverging lens, after refraction light rays move away from one another.
What is a Concave Lens?
A concave lens is thinner at the center and thicker at the rim. It disperses the coming light and also called diverging lenses.
What is Convex Lens?
A convex lens is thicker at the center and thinner at the rim. These kinds of lenses converge light rays at the focal point are also called the converging lenses.