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 = +4SDTOTO menyediakan berbagai link alternatif login untuk bermain slot gacor hari ini server luar negeri dan togel 4D on dengan peluang jackpot maxwin