Philip P. answered • 03/20/18

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**M = f**

_{o}/f_{e}- M = magnification = 60
- f
_{o}= focal length of the telescope = 6.33 m = 633 cm - f
_{e}= focal length of eyepiece

M = f

_{o}/f_{e}60 = 633/f

_{e}Solve for f

_{e}. The units will be cm.