A convex reflector.
Your question needs more information. Convex means a surface curves out, while concave means the surface curves in.
Most all corrective lenses are convex. Anything round, or even just "roundish" has a convex shape. From bowling balls to chickens' eggs, they are all convex, or "rounded outward" in shape.
Convex
A convex shape.
A convex lens curves outward, forming an elliptical shape.
outward
convex
A mirror that is curved outward is convex. A mirror that is curved inward is concave.
A convex reflector.
A "concave" mirror curves inward. A "convex" mirror curves outward.
Such a mirror is concave.
convex
Convex Mirror
A magnifying glass is convex, meaning that the lens curves outward.
)( is a concave lens() is a convex lens
Your question needs more information. Convex means a surface curves out, while concave means the surface curves in.