The optical power of the lens is -2 diopters. What is the focal length of the lens? What kind of visual defect do these glasses correct?
| December 11, 2020 | education
D = 1 / F, the reciprocal of the focal length of the lens is the optical power of the lens. We know D = – 2dopters => F = 1 / D F = 1 / – 2 = – 0.5 “-” minus means a diffusing lens that corrects myopia.
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