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I require some clarification on what the angle of deviation
is. In the physics text <EM>Fundamentals of Physics an
Introductory Course</EM>, it states that it is the angle between the
original path of the incident ray of light entering a prism, and the
path that the emerging light ray. As far as I can tell, there
are 2 angles here, one greater than 90 degrees, and one less
than 90 degrees. Is the angle of deviation defined to be less
than 90 degrees?