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Angle of deviation




Hello,

I require some clarification on what the angle of deviation is.  In the physics text Fundamentals of Physics an Introductory Course, 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?

Thank you in advance,

Blair Drader



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