A viewer with normal vision looks at a scene located at a distance a = 15 m through binoculars. The focal length of the binocular lens is F1 = 20 cm, the eyepiece F2 = -5 cm. At what distance should the lens and eyepiece of the binoculars be located so that the viewer can most clearly see the scene if the image is viewed from a distance of best vision d = 25 cm?

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