N = 660 lines/mm = 66 * 104 /m
d sin theta = m * lambda
m = d sin theta / lambda
N = 1 / d
m = sin theta / N * lambda
= (sin 90) / ( 66 * 104 * 380 * 10-9)
m = 3.98 = 4
5. White light (380nm-750nm) strikes a diffraction grating (660 lines/mm) at normal incidence. What is the...
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