Diffraction by Pinhead

The beam of a laboratory helium-neon laser was spread with a telescope eyepiece and directed at the head of an ordinary straight pin. 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 straight metal edge
Diffraction from opaque edges
Index

Diffraction concepts

Fresnel diffraction
 
HyperPhysics***** Light and Vision R Nave
Go Back