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power 4dMalaysia Live 4D Results for Magnum 4D, Sports ToTo, 4D88, DaMaCai 4D, Sarawak Cash Sweep & Sandakan 4D. Get inspired for your next buy. MY4DTo find the effective power of a combination of a convex lens and a concave lens, we can follow these steps: 1. Identify the Powers of the Lenses : - The power of the convex lens (P1) is given