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Working with diffraction grating - angular separation

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Hi. Can someone please show me how to do the following problem? Thank you.

"A diffraction grating has 2200 lines/cm. What is the angle between the first-order maxima for red light ( = 690 nm) and blue light ( = 410 nm)?"

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The general Bragg diffraction condition is,

d(sin èm - sin èi) = m ë.

Consider normal incidence, èi = 0 d sin èm = m ë

where d is the grating spacing

2200 lines/cm ==> 1cm is divided ...

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