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Diffraction Grating - Separation between two spectral lines

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Two wavelengths λ and λ + d λ are incident on a diffraction grating. Show that angular separation between the spectral lines in the m-order spectrum is dλ / sqrt ((a/m)^2- λ ^2)

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Two wavelengths λ and λ + d λ are incident on a diffraction grating. Show that angular separation between ...

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