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On the other hand, if the prism is equilateral, you can take advantage of
a very nice property of the internally reflected light to find the angle
of minimum deviation quite accurately. In this case collimated incident
light of all wavelengths that suffers three (properly ordered) internal
reflections with the prism sides will emerge once again collimated.
Furthermore, the propagation direction is precisely that of noninternally
reflected light of the particular wavelength which happens to be at its
minimum deviation for the specific prism orientation. (Boy does the above
ever need a figure!)