power 4dA convex lens of power 4D is kept in contact with a concave lens of power 3D, the effective power of combination will be . View Solution; The power of a concave lens is 10 D and that of aThe 4 Discips of. Execution (4DX) Apa itu 4DX? 4DX adalah proses untuk mencapai sasaran atau goals secara efektif. Kenapa 4DX? 1. Menentukan Prioritas 2. Disiplin Eksekusi