http://www.ck12.orgCHAPTER
22 Visible Light
Chapter Outline
22.1 The Light We See
22.2 OPTICS
22.3 VISION
22.4 REFERENCES
There is no pot of gold at the end of this rainbow, but it’s pretty special nonetheless. Rainbows don’t form very often,
and they usually don’t last very long. Maybe because they are relatively rare or because they often signal the end of
a rainstorm, some people think rainbows are a sign of good luck. You may have noticed that rainbows form when
the sun starts to come out while raindrops are still falling. What do the sun and raindrops have to do with rainbows?
In this chapter, you’ll find out.
Martina Rathgens.www.flickr.com/photos/riviera 2008 / 5176587882 /.CC BY 2. 0.