Power Toto 655 Result Malaysia

power 4dLatest Live 4D Results for Magnum 4D, Sports Toto 4D, Damacai 1+3D, Diriwan 88 Lotto 4D, Sarawak Special Cash Sweep 4D, STC 4D, Singapore Pools 4D + Toto6. A convex lens of power +6 D is placed in contact with a concave lens of power –4D. What will be the nature and focal length of this combination ? (a) convex, 100 cm (b) convex, 50 cm