What is the total number of lines a grating must have in order just to separate the

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What is the total number of lines a grating must have in order just to separate the sodium doublet (λ1 = 5895.9 Å, λ2 = 5890.0 Å) in the third order?

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Optics

ISBN: 978-0133977226

5th edition

Authors: Eugene Hecht

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