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Two thin convex lenses as made of glass are placed in close contact with each other. The focal length of each lens is F. If the space between the lenses is filled with same glass material ,then the effective focal length of the system is

Answer» Two thin convex lenses as made of glass are placed in close contact with each other. The focal length of each lens is F. If the space between the lenses is filled with same glass material ,then the effective focal length of the system is


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