What's the Difference Between 'Concave' and 'Convex'?

In this blog post we look at when to use concave and when to use convex.

'Concave' or 'Convex'?

"Concave" and "convex" are terms that are used to describe the curvature of a surface or line.

A surface or line is "concave" if it is curved inward, like the inside of a bowl. For example, the inside of a spoon is concave, and the surface of a mirror that is used to focus light is also concave.

A surface or line is "convex" if it is curved outward, like the outside of a ball. For example, the outside of a basketball is convex, and the surface of a lens that is used to magnify objects is also convex.

Here are some examples of "concave" and "convex" in use:

  • "Concave" examples:

    • The inside of a spoon is concave.

    • The surface of a mirror that is used to focus light is concave.

    • The inside of a bowl is concave.

  • "Convex" examples:

    • The outside of a basketball is convex.

    • The surface of a lens that is used to magnify objects is convex.

    • The outside of a baseball is convex.

Examples of Concave in a Sentence

Here are 10 example sentences using the word "concave":

  1. "The inside of the spoon was concave, making it perfect for scooping up food."

  2. "The surface of the mirror was concave, allowing it to focus light and create a clear image."

  3. "The inside of the bowl was concave, making it easy to hold and pour from."

  4. "The concave shape of the boat hull allowed it to cut through the water more efficiently."

  5. "The concave shape of the chair made it more comfortable to sit in."

  6. "The concave design of the headphones helped to create a more immersive listening experience."

  7. "The concave shape of the skateboard deck allowed for better stability and control."

  8. "The concave shape of the golf club face helped to create more spin on the ball."

  9. "The concave shape of the archery bow allowed for greater tension and power when shooting."

  10. "The concave shape of the theater seating made it easier to see the stage from any angle."

Examples of Convex in a Sentence

Here are 10 example sentences using the word "convex":

  1. "The outside of the basketball was convex, making it easy to grip and handle."

  2. "The surface of the lens was convex, allowing it to magnify objects and create a clearer image."

  3. "The outside of the baseball was convex, making it easier to catch and throw."

  4. "The convex shape of the car mirror allowed the driver to see more of the surrounding area."

  5. "The convex shape of the safety helmet helped to protect the head from impact."

  6. "The convex shape of the door handle made it easier to grip and turn."

  7. "The convex shape of the frying pan made it easier to cook food evenly."

  8. "The convex shape of the watch crystal made it more resistant to scratches and cracks."

  9. "The convex shape of the phone screen made it easier to see from any angle."

  10. "The convex shape of the dashboard made it easier for the driver to see all the gauges and controls."


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Concave or Convex
Concave or Convex