Certified Paraoptometric (CPO) Practice Exam 2024

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the Certified Paraoptometric Exam! Study with flashcards and multiple choice questions, each with hints and explanations. Get ready for your exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.


What measurement unit is associated with the bending effect of a prism?

  1. Diopter

  2. Focal length

  3. Millimeter

  4. Centimeter

The correct answer is: Diopter

The bending effect of a prism is measured in diopters, which quantifies the degree to which light is bent as it passes through the prism. The diopter is a unit of measurement that expresses the refractive power of a lens or prism, and is defined as the reciprocal of the focal length in meters. In the context of a prism, it directly relates to how much the light path is altered due to the prism's geometry and material properties. The other units listed, such as focal length, millimeter, and centimeter, pertain to measurements of distance or length but do not specifically convey the bending effect induced by a prism in optical terms. Focal length relates to lenses and their convergence or divergence of light rather than the angular deviation caused by a prism. Millimeters and centimeters are simply units of measurement for length and do not have a direct relationship to the optical function of prisms.