Distinguish, differentiate, compare and explain what is the difference between Fresnel and Fraunhofer diffraction. Comparison and Differences.
The spreading out of light wave into the geometrical shadow when it passes through a narrow opening is known as the diffraction. The difference between Fresnel and Fraunhofer diffraction is as follows-
Comparison and difference between Fresnel and Fraunhofer Diffraction
1. In Fresnel diffraction, the source and the screen are at a finite distance from the diffracting aperture whereas, in Fraunhofer diffraction, the source, and the screen is at an infinite distance from the diffracting aperture.
2. For obtaining Fresnel diffraction, zone plates are used. In Fraunhofer diffraction, the single-double plane diffraction grating is used.
3. In Fresnel, the wave-fronts are divergent either spherical and cylindrical while in Fraunhofer, the wave-fronts are the plane which is realized by using the convex lens.
4. In Fresnel, no mirror or lenses are used for observations while in Fraunhofer, diffracted light is collected by a lens as in a telescope.