In a laboratory five convex tenses L1, L...

In a laboratory five convex tenses `L_1, L_2, L_3, L_4` and `L_5` of focal lengths, 3 cm, 6 cm, 9 cm, 12 cm and 18 cm respectively are available. If two of these lenses form a telescope of length 12 cm and magnifying power 3, then objective and eye piece lenses respectively are

`L_5, L_2`

`L_3, L_1`

` L_4,L_2`

`L_2,L_1`

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