Question

In Fresnel's diffraction, wavefront must be

Answer 1

Answer

Diffraction is a phenomenon that occurs when light comes across an object and is obstructed. The essential condition for diffraction to occur is that the wavelength of light should be comparable to that of the size of the object. It might also occur if the size of the object is less than the wavelength of light.

Answer 2

Answer-

• The approximations made for Fraunhofer Diffraction are no longer valid. � The light source can no longer be considered a planar wavefront at the aperture because it can longer be approximated to originate at infinity. � It must be considered a spherical wavefront.

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