• Study of the phenomenon of interference of light when reflected from a flat and spherical surface;
• Observation of Newton's rings;
• Determination of the radius of curvature of the lens surface and the wavelength of light.

The setup includes an optical bench with a radiation source stand and an optical box, providing for the installation of optical elements in the required configuration. The radiation source unit includes two emitters, which can be installed in turn in the optical circuit and connected to the power terminals. The "Newton's Rings" object is mounted inside the optical box, which also contains a beam-splitting plate. A digital microscope connected to a computer is used to observe and photograph the interference pattern. The setup is equipped with a sliding light-tight casing, which prevents external light from entering the optical box.

The basis of the data processing method is the plotting on the screen of the dependence of the square of the radius of the ring on its number r_k² = Rλk — 2Ra, approximation of experimental points by a function of the form Y=AX+B and determination of the parameters required by the laboratory assignment based on the calculated values ​​of A and B (the radius of curvature of the lens using the known wavelength of one source and then the wavelength of the second light source, as well as the size of the "speck of dust" that prevents the optical elements from coming close to each other). The radii of the dark rings are determined by combining the circles constructed in the processing program with the dark rings in the photograph of the interference pattern and recalculating the radii taking into account the scale of the shooting.