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The laser beam image produces an effect on the accuracy of measurement of the laser instrumental system of aircraft landing. The paper considers the results of laser beam passage at 1.6 mm wavelength in the fog meteorological visibility (MV) is 300 m. Using the brightness body we construct the laser beam image. In the calculation we used the improved small-angle approximation of the radiation transfer theory. The effect of turbulence is also considered. Keywords: fog, image, laser, beam, visibility.