Describe a diffraction grating and the interference pattern it ... | Filo

3.3: Diffraction Gratings

An interference pattern produced by a diffraction grating that has 1000 slits per mm is composed of a series of sharp and narrow diffraction maxima. How would the width of individual maxima change if the grating is replaced by another grating that has the same number of slits per mm but has only 250 slits? Assume that the entire grating is illuminated by a perfectly coherent light.