Double Rainbows


WHEN the source of light is at a practically infinite distance, as in the case of the sun, the position of the bow is determined only by the positions of the source and of the observer's eye. When, therefore, a bow is seen double, there must be two effective sources. The phenomenon described by Mr. Deodhar in NATURE of December 13, p. 860, cannot be explained as due to two parallel rain showers. Moreover, his laboratory experiment with a source of light near to the observer would be likely to mislead him, for the conditions brought about by the near approach of the source are greatly and strangely modified (see NATURE, Vol. 105, May 27, 1920, p. 389).

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BARTRUM, C. Double Rainbows. Nature 115, 16 (1925) doi:10.1038/115016b0

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