Diffraction about pinhead, razorblade, wood screw using laser.

Diffraction about pinhead, razorblade, and wood screw using laser beam. Note: The Goniometer is not really necessary. A monochromatic Helium-Neon laser beam is expanded by passing it through a x40 microscope objective. Various small objects (pinheads of different sizes, a pin point and a screw point, and the edge of a razor blade) are placed in the expanded beam, and the resulting diffraction patterns are projected on a white screen. Note that the patterns are also visible within the projected shadows of the objects...E.G.: there is a point of light at the center of the round pin head, etc.