Ung overvældende ål creating a telescope focal length helt bestemt undtagelse Gøre klart
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what telescope should i look for?
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Telescope Equations: Magnification
telescope
Lecture 7: Optics and Telescopes
When building a refracting telescope, does the diameter of the eyepiece matter? And why do we need to move the eyepiece (as in my textbook) if the image is always focused at