Convex. The hearts inward point makes this so.
convex
An arrow can have both concave and convex surfaces, depending in its design.
It can be convex or concave.
A rhombus is an equilateral parallelogram. As such, it is neither concave nor convex.
Rectangle
convex
A magnifying glass is convex in shape.
A magnifying lens is typically convex in shape.
A geometric star shape is concave. A star that is in the sky is convex.
A converging lens is also known as a magnifying lens. The shape of the lens is a double convex shape.
Convex is usually bigger than concave. In a convex shape, an imaginary line connecting any two points lies completely within the shape, making it appear more expansive. In contrast, a concave shape curves inward, often providing less surface area than a convex shape of similar dimensions.
An arrow can have both concave and convex surfaces, depending in its design.
A convex shape curves outward like a bowl, while a concave shape curves inward like a cave. Convex shapes do not make things upside down.
Concave is thinner in the center than the edges and convex lens is thicker in the center than on the edges :)
The eye itself is concave, meaning it is curved inward. The cornea and lens within the eye, however, are convex in shape.
concave
A spoon is concave, as its bowl-like shape curves inward. This concave shape allows the spoon to hold and scoop up food effectively.