[" What should be the value of distance ...

[" What should be the value of distance d so that final im."],[" lengths of the lenses are written on the lenses "],[[" (A) "10cm," 10"cm-20cm],[" (B) "20cm," 10"cm-20cm],[" (D) "5cm," ? "],[" (D) None of these "," 10"cm]]

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