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power 4dDisclaimer: 4D88 is a 4D results site, we never sell 4D, Government licensed lottery are legal in Malaysia, Cambodia & Singapore, Only buy from government approved 4D operator. 4D88 doTo 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