What is the angular separation of two spectral lines of

What is the angular separation of two spectral lines of

What is the angular separation of two spectral lines of wavelengths 417 nm and 388 nm formed in order m = 2 with a 456 line/mm grating? If the two spectral lines are 2 cm apart, how far is the screen from the grating? I have the answer for the first have but not the second

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