Consider a cylindrical surface and a disk oriented coaxially as shown in the figure. The c...

Consider a cylindrical surface and a disk oriented coaxially as shown in the figure. The cylinder has a diameter D and a length L. The disk of diameter D is placed coaxially with the cylinder at a distance L. If L = 2D, determine the view factor F12 between the cylindrical surface (1) and the disk (2) facing it.