A diffraction grating is made up of slits of width 290 nm


A diffraction grating is made up of slits of width 290 nm with separation 910 nm. The grating is illuminated by monochromatic plane waves of wavelength ? = 710 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 1400 slits?

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Physics: A diffraction grating is made up of slits of width 290 nm
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