Certified Paraoptometric Practice Test

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Prepare for the Certified Paraoptometric Test! Study using flashcards, multiple choice questions, and detailed explanations. Get ready for your exam and boost your optometric skills!

Practice this question and more.

Which type of lens displaces light instead of focusing it?

Prism
Pl-cylinder
Effective diameter
diopter

The correct answer is: Prism

A prism is used to displace light, not focus it. Prisms are often used to create effects such as a rainbow or to separate white light into different colors. A Pl-cylinder is short for a cylindrical lens, which is used to focus light in one direction. Effective diameter is a measure that's used to describe the size of a lens, but it doesn't affect how light is focused. A diopter is a unit of measurement used to determine the strength of a lens, but like effective diameter, it doesn't affect the way light is focused. Therefore, A prism is the only option that displaces light instead of focusing it.