American Board of Opticianry (ABO) Practice Test

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Prepare for the ABO (American Board of Opticianry) Test with interactive flashcards and hundreds of multiple choice questions. Updated for 2025 to help you excel on exam day

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A +3.00 diopter lens has what radius of curvature?

  1. 0.1766m

  2. 0.5m

  3. 1m

  4. 2m

The correct answer is: 0.1766m

A +3.00 diopter lens has a radius of curvature of 0.1766 meters. This is because diopters measure the refractive power of a lens, and the formula for calculating radius of curvature from diopters is 1/f, where f is the power of the lens in diopters. Therefore, the formula for finding the radius of curvature of a +3.00 diopter lens is 1/3.00 = 0.333 meters, or 0.1766 meters when rounded to four decimal places. Options B, C, and D are incorrect because they are significantly different from the correct answer and do not align with the formula for finding radius of curvature from diopters. Option B is 2.83 times larger than the correct answer, option C is 5.67 times larger, and option D is 11.33 times larger. These options are not realistic and do not make sense in the context of the question. Therefore, A is the most accurate and appropriate answer.