Question
For the telescope described in, what is the separation between the objective lens and the eyepiece?
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Answer
Focal length of the objective lens, $\mathrm{f}_0=140 \mathrm{~cm}$
Focal length of the eyepiece, $\mathrm{f}_{\mathrm{e}}=5 \mathrm{~cm}$
In normal adjustment, the separation between the objective lens and the eyepiece
$=f_o+f_e=140+5=145 \mathrm{~cm}$
Focal length of the eyepiece, $\mathrm{f}_{\mathrm{e}}=5 \mathrm{~cm}$
In normal adjustment, the separation between the objective lens and the eyepiece
$=f_o+f_e=140+5=145 \mathrm{~cm}$
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