secondary rainbow


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secondary rainbow

[′sek·ən‚der·ē ′rān‚bō]
(optics)
A faint rainbow of angular radius about 50° which may appear outside the primary rainbow of 42° radius, and which has its colors in reverse order to those of the primary. Also known as secondary bow.
References in periodicals archive ?
The primary and secondary rainbows contain much the same physical information.
Ray Rosich called attention to something else in the photo: "It seems to be very common for people to clearly observe the primary and the secondary rainbows but to not notice the dark band between them." This relatively dim patch of sky, known as Alexander's dark band, is created when water droplets between the colorful bows bend light away from the observer.
Because most of the light leaks out after just one reflection, secondary rainbows are usually much fainter than primary ones.