Two thin lenses of power +4 D and -2 D are in contact. What is

power 4dA convex lens of power 4D is kept in contact with a concave lens of power 3D, the effective power of combination will be . View Solution; Knowledge Check. A convex lens of focal length 40 cmVIP POWER 4D MKTHE > · Join group. About this group. AKI AKI SCAMER TAK BOLEH COPY CARTA & NOS ORANG LAIN.