In using the spectrometer for determining the index of refraction of a prism by the well-known method of minimum deviation, frequently a line is observed which does not follow the motion of the spectrum as a whole.
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Marshall, Fitzhugh Jr.
"Multiple Internal Reflection In A Prism,"
Field and Laboratory: Vol. 1
Available at: https://scholar.smu.edu/fieldandlab/vol1/iss1/1