convex
US /ˈkɑːn.veks/
UK /ˈkɑːn.veks/

1.
convex, bol
having an outline or surface curved like the exterior of a circle or sphere
:
•
The lens of the magnifying glass is convex.
De lens van het vergrootglas is convex.
•
The surface of the mirror was slightly convex.
Het oppervlak van de spiegel was licht convex.