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Length of a Galilean telescope in normal...

Length of a Galilean telescope in normal adjustment, in terms of the focal lengths of the objective `(f_o)` and that of the eyepiece `(f_e)` is

A

`(f_o+f_e)`

B

`(f_e-f_o)`

C

`(f_o+f_e)`

D

`(f_o+f_e)`.

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