Distinguish, differentiate, compare and explain what is the difference between Fresnel and Fraunhofer diffraction.

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 are as follows-

Comparison and difference between Fresnel and Fraunhofer Diffraction

  • 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 are at an infinite distance from the diffracting aperture.
  • For obtaining Fresnel diffraction, zone plates are used. In Fraunhofer diffraction, the single-double plane diffraction grating is used.
  • 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.
  • In Fresnel, no mirror or lenses are used for observations while in Fraunhofer, diffracted light is collected by a lens as in a telescope.
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