Certified Paraoptometric (CPO) Practice Exam

Question: 1 / 400

What do you call a lens that diverges parallel light?

diopter

spherical

Concave (-)

A concave lens is a lens that diverges parallel light, causing it to spread out and reducing its power. This is the opposite of a convex lens, which converges parallel light. Option A, diopter, refers to the unit of measurement for a lens's power, but it does not describe the shape or function of the lens. Option B, spherical, can refer to both convex and concave lenses, so it is not specific enough to be the correct answer. Option D, apex, is the highest point or tip of a lens, but it does not indicate its shape or function.

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Apex

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