The values of $d_{1}$ and $d_{2}$ for final rays to be parallel to the principal axis could be: (focal length of the lenses are written above the respective lenses in the given figure).

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

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Solution

The correct options are
A $d_{1} = 10 c m, d_{2} = 15 c m$
B $d_{1} = 20 c m, d_{2} = 15 c m$
C $d_{1} = 30 c m, d_{2} = 15 c m$
If $d_{1} = 10 c m$ and $d_{2} = 15 c m$

d1 can take any value because rays coming from first lense are parallel to the principal axis.

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