Question: Plane waves from a collimated HeNe laserbeam ( 0 = 632.8 nm) impinge on a steel rod with a 2.5-mm diameter. Draw a rough graphic

Plane waves from a collimated He–Ne laserbeam (λ₀ = 632.8 nm) impinge on a steel rod with a 2.5-mm diameter. Draw a rough graphic representation of the diffraction pattern that would be seen on a screen 3.16 m from the rod.

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