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he hydrogen spectrum has a red line at 656 nm and a violet line at 434...

he hydrogen spectrum has a red line at 656 nm and a violet line at 434 nm. What angular separation between these two spectral lines is obtained with a diffraction grating that has 4554 lines/cm? (Assume that the light is incident normally on the grating.)

first order separation     °
second order separation     °
third order separation  
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