Here is a "full" rainbow - where you can actually see both "ends" of the rainbow!
There wasn't enough in the image for the stitching s/w to do a reasonable job - and the water waves also didn't help much... Thus you can see the "stitching" of the images... Should have had a Wide Angle Lens (which I now have... Oh well....)

One the right hand side, (near the dark roof), you can also see part of the second rainbow!

Regards,
Dick