Certified Ophthalmic Assistant Practice Exam

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Study for the Certified Ophthalmic Assistant Exam. Prep with flashcards, multiple choice questions, and detailed explanations. Ace your exam!

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What is the power of a lens with a focal length of 2 meters?

1.5D
0.5D
2.5D
1.0D

The correct answer is: 0.5D

The power of a lens is the reciprocal of its focal length in meters when the focal length is measured in meters. Therefore, if a lens has a focal length of 2 meters, the power of the lens would be 0.5 diopters (D). This relationship is derived from the formula: Power (in diopters) = 1 / Focal length (in meters). So, the correct answer is B. Options A, C, and D are incorrect because they do not represent the correct calculation for the power of a lens with a focal length of 2 meters.