General terms:
* Lens: This is the most general term and can refer to any curved piece of glass that refracts light.
* Curved glass: This is a simple and straightforward description.
Specific shapes:
* Convex lens: A lens that bulges outward, causing light rays to converge.
* Concave lens: A lens that curves inward, causing light rays to diverge.
* Cylindrical lens: A lens with a curved surface in one direction only.
* Spherical lens: A lens with a curved surface that is symmetrical in all directions.
Other terms:
* Prisms: These are pieces of glass with triangular shapes that refract and disperse light.
* Mirrors: These are pieces of glass with reflective surfaces that can be curved to focus or disperse light.
The specific term you would use depends on the context and what you are trying to describe.
