Meniscus is when one surface is concave and the other convex.

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

Meniscus is when one surface is concave and the other convex.

Explanation:
One surface concave and the other convex describes a meniscus lens. In optics, a meniscus has opposite curvatures on its two surfaces—one side curves inward while the other curves outward. That contrasts with bioconvex (both surfaces bulge outward), bioconcave (both surfaces curve inward), and plano-concave (one surface is flat and the other is concave). So the term that matches the description is the meniscus, which can be either positive or negative depending on which surface is steeper, but the defining feature is the opposite curvatures on the two sides.

One surface concave and the other convex describes a meniscus lens. In optics, a meniscus has opposite curvatures on its two surfaces—one side curves inward while the other curves outward. That contrasts with bioconvex (both surfaces bulge outward), bioconcave (both surfaces curve inward), and plano-concave (one surface is flat and the other is concave). So the term that matches the description is the meniscus, which can be either positive or negative depending on which surface is steeper, but the defining feature is the opposite curvatures on the two sides.

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