The above is a photograph of our setup. As diagramed below, the He-Ne laser provides the monochromatic source of light. It travels through the diffraction aperture and then through the converging lens (an actual bombardier's lens). For diffraction apertures, we used a single slit, a wire screen and a pin hole (made from a piece of aluminum foil).
At the Fraunhofer Plane, or the focal length of the lens, the spatial filter is placed. For filters, we used pieces of black paper, perpendicular to the incident light.
This picture is of a filter that
removes signal information around the central peak of the diffraction pattern.
The filtered light travels a distance of 181.45 cm - 30.31 cm = 151.14 cm to form an image at the shutter of the video camera.
The mirror was used to add length to the image distance on our table. With the length it added, we could obtain greater image magnification. The magnification yielded from this setup was about 6.659. From this knowledge, we could determine the width of the slit, size of the screen and diameter of the pinhole.