Answer
92 cm
Work Step by Step
Use equation 25-3 to find the magnification of the telescope.
$$M=-\frac{f_o}{f_e}$$
$$f_e=-\frac{f_o}{M}=-\frac{88cm}{-25}\approx 3.5cm$$
See Figure 25-20. When the object and the image are both far away, the separation of the 2 lenses is the sum of their focal lengths.
$$L=f_o+f_e=88cm+3.52cm\approx 92cm$$