What is the power of a lens that has a focal length of -40 cm?
A) -2.5 diopters
B) -4.0 diopters
C) +4.0 diopters
D) +2.5 diopters
E) +2.7 diopters

Name: What is the power of a lens that has a focal length of -40 cm? A) -2.5 diopters B) -4.0 diopters C) +4.0 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, convert to meters (-0.4 m) and take the inverse: -1/0.4 = -2.5 diopters.

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