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secondary rainbow

   Also found in: Dictionary/thesaurus, Medical, Wikipedia 0.01 sec.
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.


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A secondary rainbow is the rainbow you sometimes see outside the primary rainbow.
The light in each droplet is reflected twice in a secondary rainbow.
 
 
 
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