A new class of rainbows is created when a droplet is illuminated from the inside by a point light source. The position of the rainbow depends on both the index of refraction of the droplet and the position of the light source, and the rainbow vanishes when the point source is too close to the center of the droplet. Here we experimentally measure the position of the transmission and one-internal-reflection total-internal-reflection rainbows, and the standard (primary) rainbow, as a function of light-source position.
© 2003 Optical Society of America
Original Manuscript: January 23, 2002
Revised Manuscript: April 12, 2002
Published: January 20, 2003
Charles L. Adler, James A. Lock, Jonathon Mulholland, Brian Keating, and Diana Ekelman, "Experimental observation of total-internal-reflection rainbows," Appl. Opt. 42, 406-411 (2003)