Page 31 - Photonics Essentials an introduction with experiments

Electrons and Photons

Electrons and Photons 25

(a)

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(b)
Figure 2.8. A conventional road map identifies the stable states that automobiles can oc-
cupy. The road map does not tell you where the automobiles are or how fast they are mov-
ing. The location of the states depends, in general, on the shortest distance between two
points in the context of the barriers imposed by the terrain. In (a) we show a road map of a
flat terrain. There are few potential variations and the roads are straight. (© BP-Amoco;
used by permission.) In (b) we show a road map of a more rugged terrain. This can result in
roads with many curves, or roads that deviate significantly from taking the shortest dis-
tance between two points. (© 2002 California State Automobile Association. Used by per-
mission.)
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