A Terrestrial Telescope Uses An Objective And Eyepiece With Focal

A terrestrial telescope uses an objective and eyepiece with focal lengths of 42 cm and 6.0 cm, respectively.
(a) What should the focal length of the erecting lens be if the overall length of the telescope is to be 1.0 m?
(b) What is the magnification of the telescope for an object at infinity?

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