Rainbow Diagram

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A bow of prismatic colors formed from the reflection and refraction of the sun and water. In the diagram, S is the sun’s rays, E is the eye. There are two bows: the primary is the inner brighter rainbow, and the secondary is dimmer and sometimes unseen.


Ellsworth D. Foster ed. The American Educator (vol. 6) (Chicago, IL: Ralph Durham Company, 1921)


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