Two wavelengths l and l 1 Dl (with Dl ,, l) are incident
Chapter 38, Problem 60(choose chapter or problem)
Two wavelengths l and l 1 Dl (with Dl ,, l) are incident on a diffraction grating. Show that the angular separation between the spectral lines in the mth-order spectrum is Du 5 Dl "1d/m2 2 2 l2 where d is the slit spacing and m is the order number
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