The Kepler tube is pointed at the Sun. The focal length of the lens is F1=50 cm, the eyepiece F2=5 cm. The screen is located at a distance of f=15 cm from the eyepiece. At what distance L between the lens and the eyepiece will a clear image of the Sun be obtained on the screen? What is the diameter D of this image? The angular diameter of the Sun is a=30°.
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