What is the length of a telescope in a normal adjustment?

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Length of a telescope is given by the sum of the focal length of the objective and the eyepiece.

                                $\boxed{\mathrm{L} = {\mathrm{f}}_0+{\mathrm{f}}_{\mathrm{e}}}$
where, 
f_o is the focal length of the objective and, 
f_e is the focal length of the eyepiece.