The focal length of a lens with +18.00 D power is which of the following in centimeters?

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

The focal length of a lens with +18.00 D power is which of the following in centimeters?

Explanation:
Power in diopters is the reciprocal of the focal length in meters. So for +18.00 D, the focal length is f = 1 / 18.00 meters ≈ 0.05556 m. Converting to centimeters gives 5.56 cm. The positive sign indicates a converging lens with a short focal length. For reference, a focal length of 3.0 cm would correspond to about 33.3 D, 7.2 cm to about 13.9 D, and 9.0 cm to about 11.1 D, none of which match 18.00 D. Therefore, the focal length is 5.56 cm.

Power in diopters is the reciprocal of the focal length in meters. So for +18.00 D, the focal length is f = 1 / 18.00 meters ≈ 0.05556 m. Converting to centimeters gives 5.56 cm. The positive sign indicates a converging lens with a short focal length. For reference, a focal length of 3.0 cm would correspond to about 33.3 D, 7.2 cm to about 13.9 D, and 9.0 cm to about 11.1 D, none of which match 18.00 D. Therefore, the focal length is 5.56 cm.

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