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A
Sunlight Second
First reflection
refraction Second
refraction
Reflection First
reflection
Enlarged raindrop
Rainbow ray
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51 First
refraction
Sunlight
Second
refraction
Rainbow ray
Observer Observer
B
FIGURE 1.15 A model helps you visualize something that cannot be observed. You cannot observe what is making a double rainbow, for
example, but models of light entering the upper and lower surfaces of a raindrop help you visualize what is happening. The drawings in
B serve as a model that explains how a double rainbow is produced (also see “The Rainbow” in chapter 7).
18 CHAPTER 1 What Is Science? 1-18
