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A diffraction grating is made up of slits of width 400 nm with separation 1100 nm....

A diffraction grating is made up of slits of width 400 nm with separation 1100 nm. The grating is illuminated by monochromatic plane waves of wavelength λ = 720 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 960 slits?

Question 2 :

A diffraction grating is made up of slits of width a with separation d. The grating is illuminated by monochromatic plane waves of wavelength λ at normal incidence. What is the angular width of a spectral line observed in the first order if the grating has N slits? State your answer in terms of the given variables.

Δθw =

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