| Fresnel diffraction
|
Fraunhofer diffraction
|
| The source and the screen are at finite distance from the diffracting aperture
|
The source and the screen are at infinite distance from the diffracting aperture
|
| For obtaining fresnel diffraction , zone plates are used
|
For this single double ae plane diffraction grating are used
|
| The wavefronts are divergent either spherical and cylindrical
|
The wavefronts are plane which is released by using convex lens
|
| No mirror or lenses are used for observation
|
Diffracted light is collected by lens as in telescope
|