How many slits are needed in a diffraction grating that must resolve the (m=1) maxima of two

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How many slits are needed in a diffraction grating that must resolve the \(m=1\) maxima of two spectral lines at \(\lambda_{\mathrm{s}}=610 \mathrm{~nm}\) and \(\lambda_{\mathrm{l}}=615 \mathrm{~nm}\) ?

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