Question

Problem 1. An opaque screen Σ contains a circular aperture 2.0 mm in diameter. A monochromatic point source (Ao = 550 nm) lies on the axis running through the center of the aperture perpendicular to Σ That source is 3.0 m in front of Σ, and point P is 3.0 m beyond it, both on the central axis. Calculate the number of Fresnel zones that fill the hole as seen from P. Will there be a bright spot or a dark spot at P? Verify that the diffraction pattern is of the near-field variety

Answer 1

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