Difference between Concave and Convex Lenses | Concave vs. Convex Lenses

Concave vs. Convex Lenses

Difference between Concave and Convex Lenses: – Do you also wear glasses or glasses to see well? If you use them, could you tell what kind they are? Concave or convex? If you belong to the club of people who do not know the difference between concave and convex lenses, read on; because this time we explain to you what the characteristics distinguish these types of lenses that work in the principles of refraction.

Difference between Concave and Convex Lenses

Convex lenses
These lenses are characterized by being thicker in the central part than in the lateral parts or edges. They are also called converging, because they focus or unite the rays of light (they converge) into a focal point called the focus of the image.

Converging lenses produce real images, which is why they are used for various optical instruments.

Concave lenses
They are just the opposite of convex lenses. They are characterized by being thinner in the middle and thicker at the edges. Instead of joining the rays of light, he pushes them away.

The concave lenses are also called divergent; because they divert the rays of light outward (diverge). Unlike the convex, they do not produce real images. Its image focus is on the left, unlike the convex lenses that have it on the right.

The images produced by these lenses are virtual and used by people with myopia.

Key differences between Convex and Concave lenses


  • The concave are thinner in the middle and thicker at the sides, while the convex are thinner at the sides and thick at the center.
  • The concave are also called divergent, while the convex are also known as convergent.
  • Concave lenses offer virtual images, while convex lenses offer real images.
  • Concave means “hollow” or “rounded”, while convex means “curved”.
  • Concave lenses are used to correct short vision problems, while convex lenses are used to correct long vision problems.
  • Concave lenses are used in myopic glasses, the door peephole, some telescopes … while the convex are used in cameras, projectors, simple telescopes, magnifiers …
  • The concave lenses have a negative focal length, while the convex lenses have a positive focal length.
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