One of the largest refracting telescopes made to date has an objective lens with a focal length

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One of the largest refracting telescopes made to date has an objective lens with a focal length of approximately 20 m. When this telescope is used to look at the full Moon, what is the angle subtended by the edges of the Moon in the image formed by the objective? If the eyepiece has a focal length of 5.0 cm, what is the total magnification?

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