High-order rainbows, up to the 200th order, formed by a pendant water drop and a 50-mW laser beam, have been observed. Some of the characteristics of the high-order rainbows, including angular intensity distributions and angular positions, are reported. Rainbow intensity as a function of order number is also presented. Rainbows beyond the 32nd order have been observed for the first time to our knowledge. Experimental and theoretical results are in reasonable agreement.
© 1998 Optical Society of America
P. H. Ng, M. Y. Tse, and W. K. Lee, "Observation of high-order rainbows formed by a pendant drop," J. Opt. Soc. Am. B 15, 2782-2787 (1998)