A diffraction grating is a large collection of evenly spaced parallel slits that produces an interference pattern similar to but sharper than that of a double slit. There is constructive interference ...A diffraction grating is a large collection of evenly spaced parallel slits that produces an interference pattern similar to but sharper than that of a double slit. There is constructive interference for a diffraction grating when dsinθ=mλ(form=0,1,−1,2,−2,...), where d is the distance between slits in the grating, λ is the wavelength of light, and m is the order of the maximum.
