Editing Fraunhofer diffraction (section)

====Semi-quantitative explanation====

[[Image:Beugungsgitter.svg|200px|thumb|right]] A simple grating consists of a series of slits in a screen. If the light travelling at an angle {{math|θ}} from each slit has a path difference of one wavelength with respect to the adjacent slit, all these waves will add together, so that the maximum intensity of the diffracted light is obtained when:
<math display="block">W \sin \theta = n \lambda, \quad n=0, \pm 1, \pm 2, \ldots </math>

This is the same relationship that is given above.