The color order in a secondary rainbow is:
Reversed compared to primary rainbow
A primary rainbow forms from light that undergoes one internal reflection inside each raindrop, producing the order red (outer) to violet (inner).
A secondary rainbow forms from light that undergoes two internal reflections inside the drop. This extra reflection flips the sequence, so the colours appear in reversed order: violet on the outer edge and red on the inner edge.
Hence, the answer is that the colour order is reversed compared to the primary rainbow.
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