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

power 4d6. 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 cmDownload our all-new 4D Model of Project Management PPT to illustrate the rht approach to manage the project and acplish the desired goals.