During a cloudy day,a primary and a secondary rainbow may be created,then the:
- Aprimary rainbow is due to double internal reflection and is formed above the secondary one.
- Bprimary rainbow is due to double internal reflection and is formed below the secondary one.
- Csecondary rainbow is due to double internal reflection and is formed above the primary one.
- Dsecondary rainbow is due to single internal reflection and is formed above the primary one.
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