The optical system consists of two collecting lenses, the main optical axes of which coincide. The focal length of the first lens is F1 = 10 cm, the second - F2 = 8 cm. The distance between the lenses is l = 50 cm. In front of the first lens at a distance d1 = 15 cm from it there is a luminous object. Find the number of images, their position and nature. Check the solution by construction.

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