What should be equal to the width of the grating

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Uploaded: 09.12.2015
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Description

What should be equal to the width of the diffraction grating with a period of 20 microns, to a first order spectrum was resolved doublet of 404.4 nm and 404.7 nm?

Additional information

Task 40709. Detailed solution shorthand terms, formulas and laws used in the decision, the withdrawal of the calculation formula and the response.
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