power 4d[ Power Pattern ] Find best premutated 4D numbers based on historical trend.For eg., ABCD=24x, AACD=12x, AABB=6x, AAAB=4x, AAAA=1x Please note thatAnswer:the power of a convex lens is always positive. as you can see here the power is +4D, therefore the nature of the lens is that it is a convex lens. we know, P = 1f. also