Consider Fraunhoffer diffraction pattern obtained with a single slit at normal incidence. At the angular position of first diffraction minimum, the phase difference between the wavelets from the opposite edges of the slit is |
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Consider Fraunhoffer diffraction pattern obtained with a single slit at normal incidence. At the angular position of first diffraction minimum, the phase difference between the wavelets from the opposite edges of the slit is |
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a) |
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b) |
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c) |
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d) |
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(d)
To have the first minimum, the path difference between the waves from and
. The path difference between the waves from
and
at the same point should be
or phase difference is