You have a converging lens with a focal length of 085 m and, Ask an Expert

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You have a converging lens with a focal length of 0.85 m, and wish to construct a refracting telescope with an angular magnification of âˆ'45.

(a) Should you use the lens you have as the objective or the eyepiece?

(b) To finish the telescope, what should be the focal length of the second lens?

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