The question given seems to be incomplete, however (f) refers to the focal point at which the image is standing in order for it to be mirrored by a converging or a diverging lens. The statement above is correct that converging lens create positive focal images, and diverging lenses create negative focal images.
the biotic one is a human in water and they flaot because of the air in our lungs and the abiotic one is a swimming buoys are filled with foam and foam floats
