American Board of Opticianry (ABO) Practice Test

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

Prepare for the ABO certification with our comprehensive test preparation resources. Engage with interactive quizzes and detailed questions created specifically for the ABO exam. Enhance your understanding of opticianry concepts and ace your certification test!

Start Multiple Choice Practice Test
Start Flash Cards

Practice this question and more.

What does specific gravity measure in the context of optometry?

  1. A. Brightness of light passing through a lens

  2. B. Thickness of a lens

  3. C. Weight of a lens

  4. D. Dispersion of light by a lens

The correct answer is: B. Thickness of a lens

Specific gravity measures the density or relative weight of a substance compared to water. In the context of optometry, it refers to the thickness of a lens. The other options are incorrect because specific gravity does not measure brightness or dispersion of light passing through a lens, nor does it directly measure the weight of a lens. While the weight of a lens may be affected by its specific gravity, it is not the main factor being measured in this context. Additionally, while thickness is related to weight, it is not the primary factor being measured when using specific gravity in optometry.

More Questions Like This