Task id13232
How many times will the illumination of the image of the Moon on the retina change when observed using a telescope (Kepler tube) if the diameter of the lens is reduced by three times (diaphragm)? The initial diameter of the lens is 150 mm, the magnification of the tube is 25. The diameter of the pupil of the eye is assumed to be 3 mm.
Detailed solution. Format gif
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