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fresnel diffraction and fraunhoffer diffractions

Q: How many classes of diffraction?

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fresnel diffraction and fraunhoffer diffractions

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Augustin Jean Fresnel has written:

'Me moire sur la diffraction de la lumie re..'

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yes,because in fresnel biprism the fringe width can be increased so that the dark and bright fringes can be seen clearly by naked eyes..but there is no such problem in fresnel biprism..

in young's double slit experiment, the pattern is the superposition of interference and diffraction. but in fresnel biprism it is purely interference pattern.

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Diffraction phenomenon is broadly classified into two categories: (a) Fresnel diffraction (near-field diffraction) The interference is considered to take place from different parts of an aperture when either the source or screen or both are at finite distance from the obstacle.

(b) Fraunhoffer diffraction (far-field diffraction) The interference is considered to take place from different parts of an aperture when either the source or screen or both are at finite distance from the obstacle.

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Diffraction phenomenon is broadly classified into two categories: (a) Fresnel diffraction (near-field diffraction) The interference is considered to take place from different parts of an aperture when either the source or screen or both are at finite distance from the obstacle.

(b) Fraunhoffer diffraction (far-field diffraction) The interference is considered to take place from different parts of an aperture when either the source or screen or both are at finite distance from the obstacle.

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