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To verify superachromatism experimentally a five-element prism, to deviate a beam of light approximately 30 degrees without dispersion or distortion, has been designed and constructed from three types of Schott glass. When tested on a spectrometer, viewing a narrow slit with a telescope magnification of approximately 30 times, no dispersion could be seen. Pointings on 7 isolated spectrum lines separated by a monochromator show a maximum dispersion of 3 sec, 1 part in 36 000.
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Robert E. Stephens (1966) studied this question.
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