the name of a curved lens that is thicker in middle?

A curved lens that is thicker in the middle is called a convex lens.

Here's why:

* Convex: This term means "bulging outwards".

* Lens: A lens is a transparent object that refracts (bends) light.

Convex lenses converge light rays, meaning they bring them together at a focal point. This is why they are also called converging lenses.