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28. White light falls normally on a diffraction grating having 3000 lines/mm. Which is the lowest order m of green light
(A=570 nm) that will appear at a larger angle 0 than the subsequent order m + 1 of violet light (A= 400 nm)?
(1) m = 1
(2) m = 2
(3) m = 3
(4) m = 4
(5) This can never happen.

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