Diffraction by Opaque Barrier

The beam of a laboratory helium-neon laser was spread with a telescope eyepiece and directed at a machined metal edge. The diffraction pattern was photographed on a screen approximately four meters from the edge.

Barrier diffraction must be handled by the techniques of Fresnel diffraction. One way to approach the calculation is by use of the Cornu spiral.

Diffraction from pinhead
Diffraction from opaque edges

Diffraction concepts

Fresnel diffraction
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