A lens that is thick at the center and thin at the edges is called a convex lens. The most common form of a convex lens has both surfaces bulging out in the middle. Three types of convex lenses are listed and then shown in the figure below.
3 Types of convex lens class 10
The three types of convex lenses are Double convex, Plano-convex, and Concavo-convex.
Read our notes on Spherical Lens class 10
Double Convex Lens – When both the surfaces of a convex lens are convex (bulging out) then the lens is called a Double Convex lens.
Plano Convex Lens – When one surface of a convex lens is plane and the other surface is convex then the lens is called a Plano-convex lens.
Concavo Convex Lens – When one surface of a convex lens is concave and the other surface is convex then the lens is called a Concavo-convex lens.
Also read, types of concave lens