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Some things to notice:
The rainbow has very little of the blue end of the spectrum in it because the light that is hitting the raindrops is mostly red because the picture was taken at sunset (or sunrise).
The second rainbow appears darker than the first, because light must reflect once more inside the drop to reach our eyes. In the first rainbow, light comes in and reflects only once off the back surface of the drop, while light reflects twice inside the drop to form the secondary rainbow. Light is lost (flies out the back of the drop, instead of reflecting) on each reflection, so its more dim. The two reflections, as opposed to one, is also the reason for the fact that the colors are reversed in the secondary bow.
The dark band in the middle is called Alexander’s dark band, and is actually just the “normal” color of the sky right there. The reason there is so much more light just inside the primary bow and just outside the secondary bow is that there is that not all light that hits the raindrops comes back out right where the rainbow occurs. A lot of light is reflected at angles less than 42° (where the primary bow is) and at more than 51° (where the secondary bow is), while very little exits the drops between 42° and 51°. So the sky starts normal at the center and then gets gradually brighter until the first bow, then drops off back to normal, and then gradually darkens after the secondary bow as well.
Rainbows are always centered at the antisolar point, which is just a fancy name for the shadow of your head (or camera, in this case), so you can tell that the sun must be behind the camera and off to the right, so that the shadow of the camera (not visible in the pic) would be off to the left. Side note, if you see a rainbow from a plane, you can actually see a full circle at 42° away from the shadow of the plane. The only reason we see them as bows is that the ground gets in the way.
I don’t know shit about lightning tho.