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Two thin plano-convex lenses each offoca...

Two thin plano-convex lenses each offocal length `f` are placed as shown in the figure
. The ratio of their effective focal lengths in the three cases is

A

`1 : 2 : 1`

B

`1 : 1 : 1`

C

`3 : 2 : 1`

D

`1 : 2 : 3`.

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