Which term describes a lens with a flat surface and a convex surface?

Which term describes a lens with a flat surface and a convex surface?

• A. Bioconvex
• B. Bioconcave
• C. Plano concave
• D. Plano convex

Answer: (D)

Lens shapes are described by how each surface is curved. One flat surface and one bulging outward surface is called plano-convex. The flat side remains flat while the other side curves outward, which causes the lens to converge light. This differs from bioconvex (two convex surfaces), bioconcave (two concave surfaces), and plano-concave (one flat and one concave surface). So the term that describes a lens with a flat surface and a convex surface is plano-convex.

Lens shapes are described by how each surface is curved. One flat surface and one bulging outward surface is called plano-convex. The flat side remains flat while the other side curves outward, which causes the lens to converge light. This differs from bioconvex (two convex surfaces), bioconcave (two concave surfaces), and plano-concave (one flat and one concave surface). So the term that describes a lens with a flat surface and a convex surface is plano-convex.