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Twon similar plano-covexlenses are combi...

Twon similar plano-covexlenses are combined together in three different wayes as shown in the adjoining figure. The ratio of the focal lenghts in three cases will be

A

0.084733796296296

B

0.042372685185185

C

0.043078703703704

D

0.084039351851852

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