A laser beam is directed onto
a wide slit and the diffraction picture is seen on the
screen behind it. The diffraction minima occur when the path difference between
the waves from the slit is equal to
1.
Integer number of wavelengths
2.
Odd integer number of wavelengths
3.
Odd integer number of half-wavelengths
4.
There is no simple relationship

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What is the difference between the Fraunhofer and Fresnel diffraction
1.
Fraunhofer diffraction considers rays that are approximately parallel
(distant screen limit), Fresnel diffraction considers rays that are not parallel
(the screen is close)
2.
Fraunhofer diffraction considers rays that are not parallel (the screen is
close) , Fresnel diffraction considers rays that are approximately parallel

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