Units {diopter} can measure how much lenses converge or diverge light {dioptric power}. Zero diopters converges light from object at one meter to focus at one meter. Three diopters converges light from object at one meter to focus at one-third meter. Minus three diopters diverges light from object at one meter to focus at three meters.
Physical Sciences>Physics>Wave>Superposition>Refraction>Lens>Focus
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Date Modified: 2022.0224