Three lenses $L_{1}, L_{2}, L_{3}$ are placed co-axially as shown in figure. Focal length's of lenses are given 30 cm, 10 cm and 5 cm respectively. If a parallel beam of light falling on lens $L_{1}$ , emerging $L_{3}$ as a convergent beam such that it converges at the focus of $l_{3}$ . Distance between $L_{1} a n d L_{2}$ will be :

40 c m

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30 c m

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20 c m

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10 c m

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Solution

The correct option is C $20 c m$

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Three lenses L1, L2, L3 are placed co-axially as shown in figure. Focal length's of lenses are given 30 cm, 10 cm and 5 cm respectively. If a parallel beam of light falling on lens $L_{1}$ , emerging $L_{3}$ as a convergent beam such that it converges at the focus of $L_{3}$ . Distance between $L_{1}$ and $L_{2}$ will be

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