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 Cambridge Science Universe (D. Jollands, ed) Vol 3: Sight, Light and Colour (CUP 1984), pp 1819
 An outstandingly wellpresented explanation, including good photographs and diagrams; aimed primarily at younger readers. (Note, however, that the angle of the secondary bow is incorrectly given as 52°54.5°, rather than 50°53°.)
[US edition: Science Universe Series (Arco Publishing Inc. 1984) ISBN 0668061774]
 Dawkins, R. Unweaving the Rainbow (Allen Lane/Penguin 1998), pp 4449
 Contains a characteristically engaging and lucid description of most aspects of the phenomenon. Mentions, but does not explain, the "rainbow angle" of 42°, which determines where the rainbow is seen.
 Lynds, Beverly T. About Rainbows
 An excellent presentation, notable for its clarity and its detailed discussion of Descartes' pioneering analysis in the 17th century. Contains a comprehensive list of references and online links (which are therefore not repeated here, except for Wicklin & Edelman).
 Nave, Carl R. (Rod), Primary and Secondary Rainbows
 Forms part of the clear and informative Hyperphysics website. Includes some attractive colour photos, labelling the various features of rainbows.
 Wicklin, F.J. and Edelman, P. Circles of Light:
The Mathematics of Rainbows
 An accessible mathematical treatment of the underlying physics. Presupposes a grasp of basic calculus for:
 the derivation of Snell's law of refraction from Fermat's minimumtime principle
 the determination of the minimum angle of deflection (the "rainbow angle")
 Contains a table of refractive indices. Includes an interactive model (similar to our Excel diagrams) that can be run online.
If you find this model useful, you may also like to look at our MSExcel version (and extension) of Dawkins' model of natural selection.
