For a telescope in normal adjustment,the length of the telescope is found to be $27 \, cm$. If the magnifying power of the telescope at normal adjustment is $8$,the focal lengths of the objective and the eyepiece are respectively:
- A$24 \, cm, 3 \, cm$
- B$27 \, cm, 8 \, cm$
- C$12 \, cm, 6 \, cm$
- D$27 \, cm, 9 \, cm$
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