The rainbow in the box
2018
We describe a three-dimensional (3D) rainbow demonstration experiment. Its key idea is to convey a particular aspect of the natural phenomenon, namely, the origin of the perceived rainbow being multiple individual glints from within a rainshower. Raindrops in this demonstration are represented by acrylic spheres arranged on pillars within a cubic volume. Defocused imaging with a camera or the eye reveals a mosaic rainbow (segment) when viewed and illuminated in the appropriate fashion.
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