Example: barber
30. Diffraction and the Fourier Transform

30. Diffraction and the Fourier Transform

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If D = 10 microns, then: 2 10 2 630 microns 0.5 D z Example #2: microwaves ( = 3 cm) If D = 10 centimeters, then: 2 10 2 1 meter 3 D z If D = 1 millimeter, then: 2 1 2 0.1 millimeters 30 D z But notice that z >> 1 mm is required in this case for the paraxial

  Microns

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