Question

What is the difference between Fresnel and Fraunhofer diffraction?

Answer 1

Fresnel diffraction	Fraunhofer diffraction
1.When waves flow through an aperture or around an object and are observed from a close distance, Fresnel diffraction is used to compute the diffraction pattern that is produced.	When the diffraction pattern is seen at a great distance from the diffracting object (in the far-field region), as well as when it is seen at the focal plane of an imaging lens, the Fraunhofer diffraction equation is used to represent the diffraction of waves.
The distance from the source and screen are finite	The distance between the source and screen is effectively finite.
The diffracted wavefront is spherical or cylindrical	The diffracted wavefront is plane.
Convex lens are not needed for diffraction	Convex lens are needed for diffraction