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The hydrogen spectrum includes a red line at 656 nm and a blue-violet line at 434...

The hydrogen spectrum includes a red line at 656 nm and a blue-violet line at 434 nm. What are the angular separations between these two spectral lines for all visible orders obtained with a diffraction grating that has 4 620 grooves/cm? (In this problem assume that the light is incident normally on the gratings.)

first order separation
This is the angle that the red line makes with the normal to the grating. The problem asks for the angular separation between the two lines. °
second order separation °
third order separation °
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