American Board of Opticianry (ABO) Practice Test 2025 - Free ABO Practice Questions and Study Guide

Question: 1 / 400

Which type of lenses represent a biconvex lens?

cylinder lenses

plus lenses

minus lenses

two plus surfaces

A biconvex lens is a type of lens that is curved outwards on both sides. In comparison, a cylinder lens only has one curved surface, while minus lenses are curved inward and do not have the outward convex shape. Plus lenses generally have a convex shape, but they are not necessarily biconvex. The only option that includes two outwardly curved surfaces, making it biconvex, is D two plus surfaces. Therefore, D is the correct answer.

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