• study of the phenomenon of diffraction of a spherical light wave on the simplest objects
• study of Fresnel's method for quantitative description of diffraction
• obtaining diffraction patterns on a circular hole and a disk and their interpretation based on Fresnel zones

The optical scheme of the installation includes a source of coherent radiation, a diffraction object and a translucent screen behind which a video recorder is installed.
To install optical elements, stands are used that can move along the optical bench.
A source of coherent radiation with a switch and a connector for connecting a power supply is mounted on one of the stands, a diffraction object is installed on the other. The third stand is used to place a screen and a video recorder.

The work includes obtaining a diffraction pattern from a hole (disk) and observing its transformation on the computer screen when the distance between the object and the light source changes. When studying diffraction on a hole, the distances between the radiation source and the diffraction object are recorded, at which dark and light spots are observed in the center of the diffraction pattern. When processing the data, the nature of the spot in the center of the diffraction pattern is compared with the number of Fresnel zones opened by the hole.