The power of a lens is +4D. Find the focal length of

power 4dCheck 4D, 5D, 6D, Jackpot results, Sports Toto (Star, Power, Supreme Jackpot), Magnum Jackpot, Damacai 1+3D Jackpot, Live from Malaysia.Real time live 4D draw results (Keputusan 4D) - Magnum 4D, Sports Toto 4D, Da Ma Cai, Sabah 88 Lotto 4D, Sarawak Special Cash Sweep 4D, STC 4D, Singapore Pools 4D + Toto.