convex

US /ˈkɑːn.veks/
UK /ˈkɑːn.veks/
"convex" picture
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.