Question: 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})

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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