Colorfilters

A grating consists of many slits, or lines, close together. In a grating, the spacing between adjacent lines is constant.

Absorptivefilters

For other orders of maxima, the relationship between the wavelength of light \(\lambda\) and angle \(\theta\) is shown by the equation:

Constructive and destructive interference can be explained in terms of phase and path difference. Interference patterns can be calculated using wavelength, grating spacing and angle of maxima.

DielectricFilters

Compared to a double slit, the interference pattern produced by a grating has fewer, more widely spaced points of maximum intensity.

Gratings are also used to produce interference patterns. When waves are incident on a grating all of the lines act as coherent sources of the waves.