Which lens term describes one surface plano and the other concave?

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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

Which lens term describes one surface plano and the other concave?

Explanation:
Plano-concave describes a lens with one flat (plano) surface and one inward-curved (concave) surface. This shape causes light rays to diverge as they pass through, giving the lens a negative focal length. The term directly captures the geometry: flat on one side, concave on the other. The other options involve two curved surfaces (bioconcave, bioconvex) or a plane plus a convex surface (plano-convex), which would not describe a concave surface.

Plano-concave describes a lens with one flat (plano) surface and one inward-curved (concave) surface. This shape causes light rays to diverge as they pass through, giving the lens a negative focal length. The term directly captures the geometry: flat on one side, concave on the other. The other options involve two curved surfaces (bioconcave, bioconvex) or a plane plus a convex surface (plano-convex), which would not describe a concave surface.

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