Although fogbows are similar in apparent diameter to rainbows they are formed by much smaller droplets where the diffraction of light dominates. The fogbow is much broader than a rainbow and the colours overlap so much that the result is almost colourless.

Apparent size

Fogbow apparent size Fogbow segments


Full arcs

Full fogbows Fogbow polarisation


See Les Cowley's Atmospheric Optics site for a detailed explanation of how the fogbow is formed.

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