What is the power of the lens that has a focal length of 40 cm and a diameter if 5.0 cm?
A)-2.5 diopters
B)+20 diopters
C)+0.20 diopters
D)+2.5 diopters
E)+2.7 diopters

Name: What is the power of the lens that has a focal length of 40 cm and a diameter if 5.0 cm? A)-2.5 diopters B)+20 diopters C)+0.20 diopters D)+2.5 diopters E)+2.7 diopters
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Question

Quizplus · Accepted Answer

The power of a lens (in diopters) is the inverse of the focal length (in meters). For a focal length of 40 cm (0.4 meters), the power is 1/0.4 = +2.5 diopters.

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