Posted by **Lanise** on Thursday, April 22, 2010 at 8:53pm.

A telescope has a magnification of 20 and consists of two converging lenses, the objective and the eyepiece, fixed at either end of a tube 60.0 cm long. Assuming that this telescope would allow an observer to view a lunar crater in focus with a completely relaxed eye, what is the focal length of the eyepiece?

The eyepiece must form its image at infinity.

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