Feature
Visions From the Top of a Swing Set: Visibility for Kids, Part 2
This article is the second in a pair to provide ideas for helping youngsters understand the limits to visibility. Last month (January OPN, page 66), I suggested showing youngsters that the atmosphere can affect how far you see by introducing the concept of path radiance, or airlight. I gave several examples of ways to observe the naturally occurring path radiance in the atmosphere, and included experiments demonstrating that the path radiance depends on several variables, such as the amount and character of the scattering medium.
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