An observer with normal vision examines the Moon through a telescope, the lens of which has a focal length F1 = 2 m and an eyepiece F2 = 5 cm. The observer's eye is accommodated to the distance of best vision d = 25 cm. How far should the eyepiece be moved in order to obtain an image of the Moon on the screen at a distance d = 25 cm from the eyepiece? What are the dimensions of the image of the Moon on the screen if its angular dimensions are a = 30?

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