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A diffraction grating is made up of slits of width 440 nm with separation 1300 nm....

A diffraction grating is made up of slits of width 440 nm with separation 1300 nm. The grating is illuminated by monochromatic plane waves of wavelength λ = 810 nm at normal incidence. (a) How many maxima are there in the full diffraction pattern? (b) What is the angular width of a spectral line observed in the first order if the grating has 1300 slits?

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