Solving a problem in physics section 76 point 66 optics

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66. What should be the width of a diffraction grating with a period of 20 μm in order for a doublet λ1 = 404.4 nm and λ2 = 404.7 nm to be resolved in the first-order spectrum?
Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)