The power of a lens is 4.0 diopters and its diameter is 5.0 cm. What is the focal length of this lens?
A) 10 cm
B) 25 cm
C) 55 cm
D) 2.5 cm
E) 0.25 cm

Name: The power of a lens is 4.0 diopters and its diameter is 5.0 cm. What is the focal length of this lens? A) 10 cm B) 25 cm C) 55 cm D) 2.5 cm E) 0.25 cm
Brand: Quizplus
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Question

Quizplus · Accepted Answer

The power of a lens in diopters is the inverse of the focal length in meters. Therefore, a lens with a power of 4.0 diopters has a focal length of 1/4.0 meters, which is 0.25 meters or 25 cm.

The Power of a Lens Is 4