Lenses have the following values of optical power: 1.5doptr, 3dptr. Which lens has the longer focal length?
| November 23, 2020 | education
Lens power formula:
D = 1 / F
Express F:
F = 1 / D
F1 = 1 \ 1.5 = 0.7 m
F2 = 1 \ 3 = 0.3 m
F1 is greater than F2.
Answer: A lens with an optical power of 1.5 diopters has a longer focal length.
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