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[" 105.Two convex lenses with power 2dio...

[" 105.Two convex lenses with power 2dioptre "],[" are kept in contact with each other."],[" The focal length of the combined lens "],[" system is "],[" (a) "0.10m],[" (b) "2m],[" (c) "4m],[" (d) "0.25m]

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