Q14. The following figure represents two biconvex lenses $L _ { 1 }$ and $L _ { 2 }$ having focal length 10 cm and 15 cm\\
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respectively. The distance between $L _ { 1 } \& L _ { 2 }$ is :\\
(1) 10 cm\\
(2) 35 cm\\
(3) 25 cm\\
(4) 15 cm