The optical power of the lens is D = 4 diopters. what is the focal length of this lens? what kind of lens is it?
| November 26, 2020 | education
D = 4 diopters.
F -?
The optical power of a lens D is called the inverse value proportional to its focal length F: D = 1 / F.
F = 1 / D.
F = 1/4 diopters = 0.25 m.
If D> 0, then the lens is converging, if D <0, then the lens is scattering.
Since 4 diopters> 0, the lens is converging.
Answer: the focal length of the collecting lens is F = 0.25 m.
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