There are four convex lenses $L_{1}, L_{2}, L_{3}$ and $L_{4}$ with focal lengths $2 \ cm, 4 \ cm, 6 \ cm$ and $8 \ cm$ respectively. Two of these lenses form a telescope of length $10 \ cm$ and magnifying power $4$. The objective and eye lenses are respectively:
- A$L_{1}, L_{2}$
- B$L_{1}, L_{4}$
- C$L_{4}, L_{1}$
- D$L_{2}, L_{3}$
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