What is the lens type called when one surface is plano and the other surface concave?

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with multiple choice questions, each question has hints and explanations. Get ready to succeed!

Multiple Choice

What is the lens type called when one surface is plano and the other surface concave?

Explanation:
A lens with one flat (plano) surface and the other surface curved inward is called plano-concave. This configuration is a diverging lens, meaning it spreads light rays and has a negative focal length. It’s commonly used to correct nearsightedness or to adjust the focal properties in optical systems. Other shapes involve both surfaces curved (bioconvex or bioconcave) or one flat with a convex surface (plano-convex), which do not match the flat-and-concave combination.

A lens with one flat (plano) surface and the other surface curved inward is called plano-concave. This configuration is a diverging lens, meaning it spreads light rays and has a negative focal length. It’s commonly used to correct nearsightedness or to adjust the focal properties in optical systems. Other shapes involve both surfaces curved (bioconvex or bioconcave) or one flat with a convex surface (plano-convex), which do not match the flat-and-concave combination.

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