On rare occasions, it is possible to observe a “double” rainbow (Fig. P24.81A). (The secondary rainbow is always present, but is usually too faint to be observed.) The ray diagram in Figure P24.81B shows how the light rays that form the secondary rainbow are refracted and reflected by a water droplet. Use this ray diagram to explain why the order of colors in the secondary rainbow is opposite to the order of colors in the primary rainbow.