power 4dPower4D merupakan situs judi slot on terpercaya dan terlengkap yang dilengkapi dengan lisensi resmi dari PAGCOR atau Philippine Amusement and Gaming Corporation.To find the focal length of the combination of two thin lenses in contact, we can follow these steps: Step 1: Identify the Powers of the Lenses We have two lenses: - Lens 1 has a power ( P1 = +4