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Th e refractive indices of typical samples of fiv e opti cal gl asses made at t he Nationa l Bureau of Stanriards were measured ove r a range of wavele ngths from 0.35 to 2.32 mi crons.This was done in such a way that th e values obtained in t h e visible a nd invisible p or t ions of t he sp ectrum are co nsis ten t wi t h one another.The res ult s are expressed for each gla ss by a six-constant disp ersion for m ula.
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Stephens et al. (1954) studied this question.
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