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A diffraction grating is made up of slits of width 360 nm withseparation 1300 nm. The grating is illuminated by monochromaticplane waves of wavelength λ = 860 nm at normalincidence. (a) How many maxima are therein the full diffraction pattern? (b) What is the angular widthof a spectral line observed in the first order if the grating has1400 slits?

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