The difference between concave and convex lies in our view of curvature:
- when the curvature is inward , we say that it is concave ;
- when the curvature is outward , we say it is convex .
We use the words concave and convex to describe the shape or curved lines, usually in the area of science: mathematics, physics, among others. Concave and convex are antonyms, that is, opposite terms.
| Concave | Convex | |
|---|---|---|
| Definition | Something that is curved inward. | That which presents an outward curve. |
| Etymology | Latin concavus : excavated, cavity | Latin convexus: rounded surface. |
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Index
Concave
The term “concave” is applied to that which has an internal curvature. It is used to describe shapes with cavities, such as the concavity of the skull, a set of bones that protect the brain.
Concave mirrors are those that look sunken and are generally used to reflect larger images.
Convex
The term “convex” is applied to that which has a rounded shape that protrudes. It is used to describe the circular outer surfaces, such as the outer surface of the skull, that gives the head the round shape.
Safety mirrors used on low-visibility street corners or in shopping centers are convex mirrors, which produce a reduced image due to the way light is reflected off them.
