What is the test for credibility of a witness who has been believed by the trier of fact?

statements given by a witness who has been believed by the [trier of fact], there must exist either a physical impossibility that they are true, or their falsity must be apparent without resorting to inferences or deductions. [Citations.] Conflicts and even testimony which is subject to justifiable suspicion do not justify the reversal of a judgment, for it is the exclusive province of the trial judge or jury to determine the credibility of a witness and the truth or falsity of the facts upon which a determination depends. [Citation.]". . . .' [Citation.]" (People v. Barnes (1986) 42 Cal.3d 284, 303-304, 306.)