what is Fresnel and Fraunhofer diffraction

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Fraunhofer Diffraction	Fresnel Diffraction
Wave fronts	Planar wave fronts	Cylindrical wave fronts
Observation distance	Observation distance is infinite. In practice, often at focal point of lens.	Source of screen at finite distance from the obstacle.
Movement of diffraction pattern	Fixed in position	Move in a way that directly corresponds with any shift in the object.
Surface of calculation	Fraunhofer diffraction patterns on spherical surfaces.	Fresnel diffraction patterns on flat surfaces.
Diffraction patterns	Shape and intensity of a Fraunhofer diffraction pattern stay constant.	Change as we propagate them further ‘downstream’ of the source of scattering.