Analysis of the beam path of Cherenkov light of extensive air shower reflected from the snow surface in the SPHERE-3 telescope.

The article analyzes the influence of the reflected Cherenkov light telescope in the SPHERE-3 project on the image geometry. The compression of the image geometry at the edges of the mosaic and the unevenness of the mosaic illumination are considered. By approximating the obtained data and comparing them with undistorted data, correcting functions were obtained that will be used when constructing the image.