What term describes a lens with one surface plano and the other surface 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

What term describes a lens with one surface plano and the other surface convex?

Explanation:
A lens with one flat surface and the other surface curved outward is called plano-convex. The name comes from its two surfaces: plano meaning flat on one side and convex meaning that the other side bulges outward. This shape tends to converge light, which is useful in optical setups and many ophthalmic applications. In contrast, a plano-concave lens has a flat side and a concave (inward-curved) side and tends to diverge light. A biconvex lens has both surfaces curved outward, and a meniscus lens has two curved surfaces with different curvatures that are not flat on either side.

A lens with one flat surface and the other surface curved outward is called plano-convex. The name comes from its two surfaces: plano meaning flat on one side and convex meaning that the other side bulges outward. This shape tends to converge light, which is useful in optical setups and many ophthalmic applications.

In contrast, a plano-concave lens has a flat side and a concave (inward-curved) side and tends to diverge light. A biconvex lens has both surfaces curved outward, and a meniscus lens has two curved surfaces with different curvatures that are not flat on either side.

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