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 the following free and ready-to-use 4d powerpoint templates and Google slides themes for the upcoming presentation. You only need to change text, logo or colors on