In the figure, the values of $d_{1}$ and $d_{2}$ for the final rays to be parallel to the principal axis are

d_{1} = 10 c m, d_{2} = 15 c m

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d_{1} = 20 c m, d_{2} = 15 c m

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d_{1} = 30 c m, d_{2} = 15 c m

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Any of the above

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Solution

The correct option is D Any of the above
Since the object is placed at focus of $L_{1}$ , hence it emerged parallel. Hence $d_{1}$ can be any thing for the ray to emerge parallel the image of $L_{2}$ which forms at focus of $L_{2}$ should also be at the focus of $L_{3}$ .
$\Rightarrow d_{2} = 20 - 5 = 15 c m$

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