What is the focal length of a 5 diopter lens?

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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

What is the focal length of a 5 diopter lens?

Explanation:
In optics, the focal length is the reciprocal of the lens power when power is measured in diopters. That is, f (in meters) = 1 / P (in diopters). For a lens with a power of 5 diopters, f = 1/5 meter = 0.2 meters, which is 20 centimeters. Positive diopters indicate a converging lens with a real focal point. The other values would correspond to different focal lengths: a focal length of 50 cm equals 2 diopters, 5 cm equals 20 diopters, and 2 cm equals 50 diopters.

In optics, the focal length is the reciprocal of the lens power when power is measured in diopters. That is, f (in meters) = 1 / P (in diopters). For a lens with a power of 5 diopters, f = 1/5 meter = 0.2 meters, which is 20 centimeters. Positive diopters indicate a converging lens with a real focal point.

The other values would correspond to different focal lengths: a focal length of 50 cm equals 2 diopters, 5 cm equals 20 diopters, and 2 cm equals 50 diopters.

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