What is a convex lens?
It is a lens that possesses at least one surface that curves outwards. It causes light to deviate inward, bringing the rays of light to a focus. Its thicker at its center than at its edges, and is used to correct far-sightedness.
A convex lens is a lens that bulges outward on both sides.
I have another comment. It does do all that stuff and who needed them to build a telescope? It's Galileo Galilie. Ohyah!
What lens is a converging lens double-convex spherical-convex plano-concave or convexo-concave lens?
CONCAVE LENS : lens that atleast possess one end inwards is called as concave lens. CONVEX LENS : lens that atleast possess one end outwards like the exterior of the sphere is called convex lens. According to the medical values convex lens are used for long sight vision problem and concave lens for short sight vision problems.