Two plano-convex lenses of equal focal lengths are arranged as shown The ratio of the combined fo...

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Two plano-convex lenses of equal focal lengths are arranged as shown
The ratio of the combined focal lengths is
(1) 1: 2: 1
(2) 1: 2: 3
(3) 1: 1: 1
(4) 2: 1: 2

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