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If fo and fe be the lengths of the objec...

If `f_o` and `f_e` be the lengths of the objective and eye-piece of astronomical tube scope, the length of the tube is :

A

`f_o+f_e`

B

`f_o-f_e`

C

`sqrt(f_of_e)`

D

`(f_of_e)/(f_o+f_e)`.

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