If a fish in an aquarium is observed from the bottom it appears in air. Give reason

:-:Refraction:-: is the phenomenon where the light rays bend its direction while travelling from "one medium to another". Here in the fish tank, the light rays travel from rarer medium to denser medium. So, the fishes appear in a larger size.','.

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach