When salt is sprinkled on a flame, yellow light consisting of two closely space wavelengths11=588.997 nm and 12=589.594 nm are produced (they were observed by Fraunhofer in theSun's spectrum).a) If this light falls on a diffraction grating with 300 lines/mm (pay attention to the units!),what is the angle between the 2nd order spectra of these two wavelengths?b) How many lines N of this grating must be illuminated for these lines to just be resolved?

Given Sodium doublet of wavelengths λ1=588.997nm and λ2=589.594nm (a) This light falls on…

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