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power 4dUse the power of 4D to optimise your schedule with a fully integrated module making it easy to generate 4D plans. Learn more . 4D planning will transform your operation – read aboutPower of the lens (P) = 4 D. Refractive Index (r) = 1.5. To Find: The radius of curvature. Calculations: The following equation determines a lens's power: where P is the power of