College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 63

(a) Find an equation for the length L of a refracting telescope in terms of the focal length of the objective f o and the magnification m. (b) A knob adjusts the eyepiece forward and backward. Suppose the telescope is in focus with an eyepiece giving a magnification of 50.0. By what distance must the eyepiece be adjusted when the eyepiece is replaced, with a resulting magnification of 1.00 × 10 2 Must the eyepiece be adjusted backward or forward Assume the objective lens has a focal length of 2.00 m.