Question

What is diffraction? Distinguish between Fresnel and Fraunhofer Diffraction.​

Answer 1

If the source of light and screen are at finite distance from the obstacle ,then the diffraction called fresnel diffraction. 1:If the source of light and screen are at infinite distance from obstacle then the diffraction is called fraunhofer diffraction. 2:The corresponding rays are not parallel.

Diffraction occurs when a wave encounters an obstacle or a slit these characteristic behaviors are exhibited when a wave encounters an obstacle or a slit that is comparable in size to its wavelength, whereas Interference is the phenomenon where waves meet each other and combine additively or substractively to form ...


We can define two distinct types of diffraction: (a) Fresnel diffraction is produced when light from a point source meets an obstacle, the waves are spherical and the pattern observed is a fringed image of the object. (b) Fraunhofer diffraction occurs with plane wave-fronts with the object effectively at infinity.

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Answer 2

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Diffraction is the phenomenon of bending of light around the corners of an obstacle apparture in the path of light is called diffraction.

definition ◇◇◇》

1)Fresnel diffraction = transfering from the portion of the wavefront which are not blocked by the obstacle or from portion of wavefront which are allowed to pass through the aperture..

2)Fraunhofer diffraction = the distance between the source and object ,object and screen should be infinite.

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