A 4.00-cm wide diffraction grating with 650 grooves per cm is used to resolve two closely spaced lines (a doublet)in a spectrum.The doublet consists of two wavelengths,$\lambda$_a = 629.8 nm and $\lambda$_b = 630.2 nm.What fraction of the grating width needs to be illuminated in order to resolve these two lines in first order?

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The Answer of A 4.00-cm wide diffraction grating with 650 grooves per cm is used to resolve two closely spaced lines (a doublet)in a spectrum.The doublet consists of two wavelengths,$\lambda$_a = 629.8 nm and $\lambda$_b = 630.2 nm.What fraction of the grating width needs to be illuminated in order to resolve these two lines in first order?

A 400-Cm Wide Diffraction Grating with 650 Grooves Per Cm Is