The power of a lens is +4D. What is the nature of lens

power 4dDisclaimer: 4D88 is a 4D results site, we never sell 4D, Government licensed lottery are legal in Malaysia, Cambodia & Singapore, Only buy from government approved 4D operator. 4D88 doA 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; The power of a concave lens is 10 D and that of a