power 4dTo 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 = +4VIP POWER 4D MKTHE > · Join group. About this group. AKI AKI SCAMER TAK BOLEH COPY CARTA & NOS ORANG LAIN.