Roger Bacon's Theory of the Rainbow: Progress or Regress?

  title={Roger Bacon's Theory of the Rainbow: Progress or Regress?},
  author={D. Lindberg},
  pages={235 - 248}
HE PRIMARY RAINBOW is explained by Theodoric of Freiberg (d. c. 1311) in the following way: when sunlight falls on individual drops of moisture the rays undergo two refractions (upon ingress and egress) and one reflection (at the back side of the drop) before transmission to the eye of the observer.1 The path of sunlight within the drop, as correctly traced by Theodoric, is illustrated in Figure 1. Yet, before the rainbow 
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This is a repository copy of Bow-shaped caustics from conical prisms : a 13 th-century account of rainbow formation from Robert Grosseteste Reuse This article is distributed under the terms of the Creative Commons Attribution (CC BY) licence. This licence allows you to distribute,Expand
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